Glossary · Crisis rooms and video walls

The words of the crisis room,
explained simply.

COD, CODIS, zone, scenario, HDMI capture: these are the terms heard every day in command rooms. For each one, a definition, then what it changes in practice in front of the video wall.

How to use it

A definition, then the field.

This glossary is for room managers, operators, IT directors and public buyers who equip or run a crisis room. The terms are sorted into four families: emergency organisation, the video wall, links and connections, and the field. Each term first gets a general definition, valid anywhere, then what it changes in practice in a room, and how our software fits in.

Emergency organisation

# COD Centre opérationnel départemental (departmental operations centre)

The COD (departmental operations centre) is the prefect's crisis room, activated when a major event affects the département. It brings together State services, emergency services, local authorities and the operators concerned, so that everyone shares the same information and decisions are coordinated. It is usually set up in the prefecture.

A COD brings together services whose computer networks must not be connected to each other. We bring their pictures together on the wall by HDMI cable, never their networks.

Equip a command room
# CODIS Centre opérationnel départemental d'incendie et de secours (departmental fire and rescue operations centre)

The CODIS (departmental fire and rescue operations centre) is the centre that coordinates the operational activity of a SDIS across the whole département. It follows incidents in progress, commits reinforcements and informs the authorities.

On a CODIS wall, we display the alert system, mapping, cameras, drone feeds and positions reported from the field. A prepared scenario, “forest fire” or “flood”, is recalled in one click when the situation changes.

The video wall for SDIS
# CTA Centre de traitement de l'alerte (alert handling centre)

The CTA (alert handling centre) is the room where fire service operators receive emergency calls, notably on 18 and 112, assess them and dispatch the rescue teams. It runs day and night.

This is the configuration we deploy most often: one server, eight inputs, one 86-inch panel, one control screen and one touchscreen.

Typical configurations
# CTA-CODIS Centre de traitement de l'alerte et centre opérationnel réunis (alert handling centre and operations centre combined)

CTA-CODIS refers to a room where alert handling and the operational coordination of a SDIS are combined in one place. The operators who take the calls and those who follow the incidents then work in front of the same video wall.

Several SDIS have renovated their room while keeping the screens in place: only the end-of-life proprietary controller is replaced by a standard PC and our software.

Renovate a SDIS wall
# SDIS Service départemental d'incendie et de secours (departmental fire and rescue service)

The SDIS (departmental fire and rescue service) is the public body that organises the firefighters of a département. It handles prevention, firefighting and emergency assistance to people, and runs the CTA, the CODIS and the mobile command resources.

28 SDIS are equipped with our software, roughly a quarter of the country. The video wall remote control was born from a request from firefighters.

Our solution for SDIS
# SAMU and dispatch Service d'aide médicale urgente (emergency medical service)

The SAMU (emergency medical service) answers calls to 15 and organises the medical response to emergencies. Dispatch is the stage where a dispatching doctor assesses each call and chooses the right response, from simple advice to sending a medical team.

The dispatch wall brings together maps, resources and video feeds, and stays on if the Internet goes down. Dispatch software is displayed like any other source.

The video wall for the SAMU
# Prefecture

The prefecture is the seat of the State's representative in the département, the prefect. In a major crisis, the prefect directs operations and activates the departmental operations centre, usually set up on its premises.

For the Pope's visit to Lourdes in 2026, we designed, built and ran the two video walls of the prefecture's control room: 18 computers displayed, a dozen entities in front of the same picture.

The Lourdes 2026 case study
# PC Poste de commandement (command post)

A command post is the place, fixed or mobile, from which a manager directs an operation and coordinates the resources committed. It can be set up in a building, a vehicle or a field structure, as close as possible to the incident.

The same software equips the fixed room, the van and the case: operators find the same gestures again the day they deploy on an incident.

From the CODIS to the mobile post
# PCM / mobile PC Poste de commandement mobile (mobile command post)

A mobile PC is a vehicle or transportable module fitted out as a command post, with screens, communication means and workstations. It is deployed as close as possible to a long-running incident or a major event.

In a mobile PC, we centralise the HDMI sockets in the vehicle and drive four screens, including an outdoor screen facing the field. SDIS 76 runs a mobile command unit equipped with our software.

See the turnkey ranges
# COS Commandant des opérations de secours (rescue operations commander)

The COS (rescue operations commander) is the fire service officer who commands, in the field, all the rescue resources committed to an operation. They act under the authority of the operations director, the mayor or the prefect depending on the scale of the event.

The COS needs the room to see what they see. Cameras, positions and photos from responders come up from the field through QuickShare, and the video wall can in turn be shared to the field on a code-protected link.

Discover QuickShare
# Crisis cell

A crisis cell is the small group of decision-makers and experts brought together to manage an exceptional situation, in an administration as in a company. It centralises information, makes decisions and follows them up until things return to normal.

The room manager announces a decision, each operator displays it within seconds: large icons, touch, no training. An emergency message can also be shown as a banner on all the walls, in one gesture.

The crisis room under control
# Crisis room

A crisis room is the dedicated place where a crisis cell meets, with workstations, communication means and a shared display. The video wall gives everyone the same view of the situation.

Between the sources and the walls, everything goes through HDMI and capture cards. Our software runs locally: an Internet outage does not deprive the room of its display.

Equip a crisis room
# Overflow room

An overflow room is an annex room opened when activity exceeds the capacity of the main room, for example during a surge of calls in a storm. Extra operators work there with the same tools.

We equip overflow rooms like CODIS and CTA: same software, same gestures, no training needed for reinforcements.

The video wall for SDIS
# RETEX Retour d'expérience (lessons learned review)

The RETEX (lessons learned review) is the analysis carried out after an event or an exercise to understand what worked, what was missing, and decide on improvement actions. It relies on a reliable timeline of facts and decisions.

Drag & Drop records the film of the wall: a snapshot at every change of display and a timestamped log. Pulse turns the log into structured RETEX sheets, and CollectivView exports captures and a PDF report.

Discover Pulse
# Event log

The event log (“main courante”) is the chronological register in which a room records, as things happen, the events, the information received and the decisions taken. It serves as a reference during the crisis and as a basis for the lessons learned review.

Pulse keeps the room's event log: each event declared in a few seconds, handled by status, then closed with its RETEX. Everything runs locally, no data leaves the room.

The event log with Pulse
# NexSIS Système de gestion opérationnelle (operational management system)

NexSIS is an operational management system used by fire and rescue services, like SYSTEL or ARTEMIS. It is one of the alert systems displayed on the wall of a CODIS.

NexSIS appears on the wall like any other source: HDMI mirroring of the operator workstation, network stream or remote desktop. No gateway to have developed, no access to request from its vendor, no open access to the alert system.

What “compatible” means

The video wall

# Video wall Screen wall, videowall

A video wall is a set of screens, or one large panel, treated as a single display surface and split into zones that each show a source. It is also called a screen wall or videowall. It gives a whole room the same view of the situation.

Our software drives from 1 to 40 screens on direct output, and more with video wall controllers. Drag & Drop composes up to 24 zones per wall, and up to 10 walls from a single workstation.

Discover Drag & Drop
# Zone

A zone is a portion of the video wall reserved for one source: a camera, a map, an operator workstation. It can be moved, resized and switched to full screen without touching the others.

Drag & Drop composes up to 24 zones per wall. In CollectivView, each zone carries a colour code, a header and the name of the service, and is called “zone” or “island” depending on the room's vocabulary.

Discover CollectivView
# Scenario

A scenario is a complete layout of the video wall, saved then recalled in one gesture: which sources, in which zones, at what size. It avoids rebuilding the display under pressure.

A CODIS prepares, for example, a “forest fire” scenario, a “flood” scenario and a “routine watch” scenario. Each key on the remote control, a tablet or a key box recalls a scenario.

Touch control of scenarios
# Source

A source is anything that can be displayed in a zone of the wall: either a physical video signal to capture, such as a workstation screen, or a network address to display, such as an IP camera or a web page.

Drag & Drop distinguishes eight types: website, file, folder, network stream, HDMI capture, installed software, RDP remote desktop and VNC session. A business application is not simply mirrored: the software launches it and places it in the chosen zone.

The source types
# Video wall controller

A video wall controller is the hardware that spreads the display across several screens so that they form a single image. It ranges from a simple box that distributes one input across several screens to a full proprietary controller, with its cards, its software and its life cycle.

We replace the proprietary controller with a standard PC and our software: the hardware becomes interchangeable and the screens already in place are kept. When a box is useful, it stays simple: at Lourdes 2026, a box set to 3 × 3 spread one image across 9 screens.

A PC instead of the controller
# Multi-screen graphics card

A multi-screen graphics card is a video card with several outputs, which lets a single computer feed several screens. It sets the number of screens that a display server drives on direct output.

In our reference configuration, each graphics card provides four outputs, and a second card brings the total to eight. DisplayPort to HDMI adapters are limited to 4K at 30 frames per second: for smooth 4K video, we prefer native HDMI outputs.

The reference configuration
# LED panel

An LED panel is a display module made of light-emitting diodes. Assembled together, panels form a large screen, with no bezel between the elements.

Our software drives an LED wall as one giant screen, split into as many zones as wanted, whether it is new or already in place. SDIS 54 thus runs an LED wall driven by Easy Multi Display.

Drive an LED wall
# 98-inch screen

A 98-inch screen is a large commercial television, big enough to serve on its own as a video wall in a command room. It avoids the bezels of an assembly of screens and is replaced like an ordinary television.

Our software splits a single large screen into several zones, without training. We have also driven four 98-inch screens, close to 10 m² of display, from a single PC, using HDMI over network cable.

# Multiview Multiviewer for the box

Multiview is the simultaneous display of several video sources on the same screen or the same wall, each in its own tile. The term also refers to the box, called a multiviewer, that composes several inputs into a single image.

CollectivView is our HDMI multiview software: up to 40 sources, 20 zones on a single wall, no network between the workstations. Upstream, a 4K multiviewer groups four sources onto a single capture input.

Discover CollectivView
# Mosaic

At Easy Multi Display, the mosaic is the display of several computers on a single screen, each in its own tile, with the option of enlarging one in a single gesture. It suits rooms that need to follow several workstations without building a full video wall.

This is our Eco range: an 8-input HDMI switch, a mini-PC and a 22-inch touchscreen, for 8 PCs on one screen, at €2,959 excl. VAT. Thirteen display modes, from a single source to the 8-way mosaic, with no capture card and no network.

See the Eco range
# Screen mirroring

Screen mirroring means duplicating the picture of a workstation to the video wall without changing anything on that workstation. It is done with an HDMI splitter placed at the workstation, or by using a free video output of its graphics card.

The workstation keeps working normally: nothing is taken from it, it is mirrored. On the operator side, “duplicate” mode shows the whole screen on the wall, “extend” mode shows only the window dropped onto it.

Duplication and cabling
# Hide a source Privacy screen

Hiding a source means temporarily removing from the wall the picture of a sensitive source, without changing the layout or cutting the source. It is used when a picture must not yet be seen by the whole room: drone camera, information being verified.

In CollectivView, the operator hides a source with a right click: the room's logo takes its place with the words “Source hidden”, on all the walls, until it is shown again. This function came out of our lessons learned from Lourdes 2026.

What we took from Lourdes

Links and connections

# HDMI capture

HDMI capture means taking the picture of a screen from its HDMI cable to display it elsewhere, without touching the workstation or its network. The cable carries only the picture: it gives no access to the files or the system of the workstation.

This is the basis of our operational rooms: workstations from networks that must not talk to each other sit on the same wall, connected by a simple video cable. Adding a source means plugging in a cable and giving it a zone.

HDMI multiview
# Capture card Acquisition card

A capture card, or acquisition card, is a component installed in a computer that receives video signals, for example over HDMI, to display or record them. Each input takes one source.

We use our capture card, 4 HDMI 4K inputs, chosen and proven by us. One or two cards in the display server are enough for most rooms, and off-the-shelf cards are still recognised.

The reference configuration
# HDMI over network cable HDMI extender

An HDMI over network cable extender is a transmitter and receiver pair that carries an HDMI signal over a CAT5e or CAT6 network cable, to place a screen far from the computer. The cable is only the physical medium: the signal stays HDMI and does not travel on the computer network.

We use it up to 40 metres to link the display server to the screens and the command workstations. The signal crosses no switch and is visible to no machine on the network.

Cabling a room
# HDMI switch (KVM) KVM: keyboard, video, mouse

An HDMI switch is a box that receives several HDMI sources and sends them to a screen, one in full size or several at once. Combined with a KVM (Keyboard, Video, Mouse), it also forwards the keyboard and mouse to the chosen computer.

Our software drives an 8-input switch from a touchscreen, over an RS232 serial link: no network, nothing to hack. Thirteen display modes, sources renamed with the room's vocabulary, scenarios recalled with one finger.

Discover the HDMI switch
# Wireless HDMI kit

A wireless HDMI kit is a transmitter and one or more receivers that carry an HDMI picture by radio, on a direct link, with no box and no computer network. It helps out where running a cable is impossible.

At Lourdes 2026, an off-the-shelf kit, one transmitter and four receivers for around a hundred euros, carried the picture of the wall to the distant islands. The walls themselves stayed on cable.

The Lourdes 2026 setup
# RDP Remote Desktop Protocol

RDP is Microsoft's remote desktop protocol: it lets you display and control the session of a Windows computer from another machine on the network.

In Drag & Drop, an RDP session is a source like any other: the remote machine appears in a zone of the wall, and the operator takes control without leaving the room. Credentials are encrypted, never stored in clear text.

Drag & Drop sources
# VNC Virtual Network Computing

VNC is a remote screen sharing system, available on most operating systems: it shows the screen of one machine and lets you control it from another.

Drag & Drop connects to the VNC service already present on the target machine, without installing anything on it. The session appears in a zone of the wall.

Drag & Drop sources
# RTSP / RTMP streams Real Time Streaming Protocol / Real-Time Messaging Protocol

RTSP and RTMP are two protocols for live video streaming over a network. RTSP is mainly used to read the stream of an IP camera; RTMP is mainly used to send a live feed to a server, from an encoder or a drone.

Our software displays these streams in a zone of the wall, with an adjustable buffer that absorbs brief network drops without losing the picture.

Discover Drag & Drop
# ONVIF camera Open Network Video Interface Forum

ONVIF is an open standard that lets IP cameras from different brands make themselves discoverable on the network and provide their stream in a standard way. An ONVIF camera integrates without a driver specific to its manufacturer.

Drag & Drop automatically discovers the ONVIF cameras on the local network, and a camera can also be entered directly as RTSP. Discovery stays within the local network, without going out to the Internet.

Cameras and interoperability
# HDMI dummy plug HDMI plug

An HDMI dummy plug is a small connector that plugs into a video output and makes the computer believe a screen is connected to it. When a screen is off, unplugged or broken, the computer keeps its display configuration instead of rearranging it.

On a video wall, it stops a switched-off screen from upsetting the layout: the zones stay in place. We sent one, at €3, to SDIS 17 to simplify the maintenance of its wall.

# Isolated local network

An isolated local network is a network limited to one site, with no Internet access and no link with the organisation's other networks. What is on it can only be reached from the inside.

In our operational rooms, the video wall is connected to no computer network: the only link between a business workstation and the wall is a video cable. Control commands stay within the local network, restricted by firewall to authorised machines.

Network flows, and nothing else
# No Internet / Local First

The Local First principle means running software entirely on site, with no cloud and no Internet connection, with data that stays with the user. In crisis management, it guarantees that the tool holds up the day the network goes down.

Once installed under licence, our software opens no connection to our servers and transmits no data. The licence is a signed file, checked on the machine at every start, with no activation server.

Our Local First approach

The field

# PTT Push-to-talk

PTT is the communication mode of the walkie-talkie: you press to talk, release to listen, and the whole channel hears. Digital PTT reproduces this gesture on a phone or a computer, over the network.

QuickShare includes a “Talk” radio in the browser: you speak to the whole channel in a single click, without radio hardware. It is for those who do not have the service's radio.

Discover QuickShare
# QuickShare

QuickShare is our software that links the field to the crisis room from a simple phone, with nothing to install: live camera, GPS position, PTT radio, MAYDAY alert, file sharing and messaging between services.

It is hosted in France, or installed on the service's own infrastructure. At Lourdes 2026, it ran on our server in the room, without Internet, so that everyone could send their screen to the wall in one click.

Discover QuickShare
# LoRa / Meshtastic

LoRa is a long-range, low-power radio technology that transmits small messages over kilometres. Meshtastic is open-source software that builds on LoRa to create a mesh radio network, with no operator and no Internet, where each device relays the others.

Meshtastic is offered as an option in our command case: messages and positions without an antenna or Internet. In QuickShare, LoRa beacons report the position of agents and a MAYDAY where 4G stops.

Discover Meshtastic
# Command case

A command case is a transportable command post: screens, work surface, network and power combined in a hardened case, deployable in a few minutes with no vehicle and no heavy installation.

We build it to order: two screens driven by a single USB-C cable, our video wall software and a tactical WiFi bubble. The base module starts at around €3,000, where the market asks €30,000 and more.

Discover the case
# Drone in the room

Displaying a drone in the room means bringing the picture filmed by a drone live into the crisis room, so that decision-makers see the incident area from the sky.

The video feed arrives over HDMI through a capture card, or through QuickShare, which lets you watch it remotely, even from 100 km away. We have tested the display of drone feeds with 16 SDIS.

Live drone with QuickShare
# GPS / geolocation

Geolocation is the determination of the position of a person or a vehicle, most often by GPS, to display it on a map. In operations, it shows in real time where the committed resources are.

QuickShare displays the position of each responder on a map in real time, with the IGN Plan and aerial layers and the fire hydrants. In a dead zone, the position comes up by LoRa radio.

The QuickShare GPS map

Frequently asked questions

The vocabulary questions we are asked.

The most common mix-ups, cleared up in two sentences.

What is the difference between a COD and a CODIS?

The COD is the prefect's crisis room, which brings together all the services concerned by a major event in the département. The CODIS is the firefighters' operations centre, which permanently coordinates the activity of the SDIS.

Video wall, screen wall, videowall: is it the same thing?

Yes: these terms all refer to a set of screens, or one large panel, treated as a single display surface split into zones. On this site, we use “video wall”.

Is a network needed to display a workstation on the video wall?

No: in a capture-based architecture, the picture of a workstation reaches the wall through an HDMI cable and a capture card, with no network link at all. The workstation stays on its own network, and the wall has no access to it.

What does “NexSIS compatible” mean for a video wall?

It means that the NexSIS display becomes a source of the wall, by HDMI mirroring, network stream or remote desktop. There is no data exchange between the two pieces of software, no gateway to develop, and no open access to the alert system.

What is the difference between a mosaic and a video wall?

A mosaic displays several computers on a single screen, like our Eco range, which brings together 8 PCs on one touch-controlled screen. A video wall assembles several screens, or one large panel, into a single surface split into zones.

Missing a term? A room to equip?

Send us the plan of your room and the list of your workstations: we send back an architecture diagram, the bill of materials and a quote, with no commitment.