Using one computer for multiple monitors far away?

Hey guys. I'm making a HL2 Map. I want monitors all around this map, so that way with one computer, I can run the program, and all of the monitors will activate. However, I have no clue how to do this. I will give an example scenario:

I'm in my office. I want to advertise that there is uncivil behavior to the citizens throughout all of the monitors. I type "run uncivilbehavior1". All of the monitors turn on with a message.

If anyone could help me, that would be amazing. Thanks.

-Kron

Requesting lock, found solution.

How you did this?