How to fake (replace) screen sharing in Skype / Zoom / TrueConf?

Question

Skype

Distance exams are starting to take place, in connection with this, the rules for taking these very exams are being invented.
Therefore, for every action there must be a reaction.

Question: how to fake (replace, "freeze") a signal with a picture or video, including a screen demonstration in communication programs?
There, let's say, there should be a desktop. But in fact - another broadcast of the same Skype with answers / text, which is controlled by another person, listening to questions. After that, I would also like to turn off this "freeze" with a hot key and go to the real desktop (where you have already exited all the prompt programs)

There is also a question about substituting (turning off) the sound:
1) turn off the microphone in hardware, so that there would be no interference, rattle and other things - so that later it can be turned on without problems and answer the ticket (at the same time, so that zoom / trueconf thinks that the microphone is working all the time and does not display it in program - usually, if you click on the button and turn off the microphone or sound, this is displayed to all interlocutors)
PS It would be cool to tweak it on the wire by hardware, but so far I don’t see a real possibility to do this

2) replace the sound from the microphone with a pre-recorded "silence" file - rustling, breathing, etc.

I would be grateful for recommendations, instructions, links and guides. The topic is relevant.

Answer 1

It is better to study, rather than skipping and looking for tricks. But such functions are performed by e2eSoft VCam

Answer 2

second computer

Answer 3

Open virtual machine? virtualbox for example
with a micro - 100% the easiest way is to buy a micro with a switch ... this will not be displayed
In theory, in the same zoom it is displayed if you mute the microphone in the broadcast, but if you just mute it in the Windows settings, it will not be displayed