Try downloading Hercules HW and give it a shot.  Type in the IP address of your receiver, click Connect and you've got an open connection.  You can fill in the 3 boxes you see at the bottom of the window with 3 different strings you want to send, then you can fire them off by hitting F1, F2, or F3.  Very useful for testing when you want to send Power On and Power Off and you can do it with 1 finger... F1, F2, F1, F2, etc.



[Link: hw-group.com]