May I control the game of a client through pressing some GuiButtons in the server application?

May I control the game of a client through pressing some GuiButtons in the server application?.

I want to create a server-client game where the server has the capability to control the developement of some characteristics of the client game in real time.

I wanna mean that if when I press a button I can change some golbal variable in the client version of the game. It can be done?

And additionally, I'd like to receive in teh server version two things:

a).-The webcam of the client server player (in a part of the server version of the screen).It can be done?

b).-The dump of the progress of the game in real time too (in another part of the server version screen).It can be done?

I'm reading a lot of how to create a server and client version of a game and how they can intercommunicate via chat...And I think that this part is being satisfactory covered.

Any idea?. I'm relatively new with Unity, but I don't know how far can arrive the capabilities of the powerful Unity3D and if all this is possible with it. but the answer of "yes" or "no" and a basic idea of how to do all this would be very helpful for me.

Thanks in advance.