ok, I tried to do some reasearch first, but haven't really found what I was looking for.

Each windows app uses a message queue that stores user input and calls the required event handler ( a simple way of putting it ... ). What I was thinking is that has to be a message queue at the kernel level, and the kernel dipatches each message to the process it belongs to ( correct me if wrong ). Now, if my assumption is true, I wonder if is there any system call to check upon this message queue and be able to view from one process what messages are dispached to other processes.

thx

None that I know of. But you might look at a copy of Undocumented Windows book. To my knowledge events go directly from the keyboard and mouse device drivers to the thread that has input focus.