In some situations it may not be desirable to install software on the workstation to be recorded. This is commonly the case in air traffic control environments for example. In these instances the passive screen recording option can be used. This works by recording the video signal between the workstation and the screen using a special hardware device. VGA, HDMI and DVI are supported.
In active mode software is installed on the workstation. This software monitors changes to the display and send image data to the server. This is a more cost effective option.