Automation for instant messaging application (Lync)

 

Do you want to control this from your tested app's UI? In this case, you will need to set up the distributing test. To coordinate master and slave computers, you can use synchronization points or Network Suite variables. During this kind of synchronization, execution of the participating projects is paused until all of these projects have reached the same synchpoint. For your case, it may mean that all slave machines will stop test execution until they get a message from a master machine:

 

Please refer to the "Synchronization Points" article for more information.