Custom Robot Controller

[The Numenorean]

Hi,

I want to use a program to send data to a robot as if it was a joystick plugged into the computer. The program would be running on the computer that the Driver Station is, so it should be able to be sent throough the connection. In essence, I don't want to change the robot code at all, just change the joystick the driver station is using to be my custom one. Read: No hardware.

Java would be optimal, but if necessary I can do it in a other language.

Anyone know how to do this?

Thank you!