Hello, please see How (not) to ask a question. (update: this link seems to be more relevant).

• We have a setup of 100 clients in our test lab.
  What kind of clients? are these windows pcs? If so, what version of windows?
• Whenever we need to stress a server we just get that server in to our test network and from the clients we login to the clients and open one application that is used to stress the servers over network.
  What kind of server? See remark above. What kind of network protocol do you use? SMB, VNC, rdesktop, custom client software, what?
• Now, I want to write an application in such a way that all the clients should be listening to one controller and whatever mouse & keyboard inputs on the controller should be sent to the clients.
  That does not sound like a very good idea to me: generally you can't send the same mouse input to a different machine and expect to click on the same application (unless you take extreme care).
• Simple example would be, if I open notepad.exe on my controller, the same should be opened on all my clients also.
  This expected behaviour is contrary to your expected solution.
• are there any classes that I can use?
  Yes. Try Win32::API.

I'm assuming a lot here.

I would think it would be a lot easier to write a script that uses Win32::API, Win32::GuiTest or some module like that, install it on a network filesystem that all the clients can read, and start the script on each client (maybe using some kind of network activation, so you can control them from one machine).

Possibly, you can use a much more elegant/efficient solution, but you don't really give us a lot of clues how.

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