Hello,

I own an RL800 robomower.  It's not wireless, which I don't like.  I
want to be able to emulate the commands coming out of it's native
wired joystick so I can implement them myself via my own software,
hopefully via Python or VB.NET.

Once the mower is "open", I think there are a lot of possiblities for
it. Like: GPS, yard training, http://www.dlink.com/products/?pid=17

To start: http://www.friendlyrobotics.com/

-Ted

Depending on the joystick you could hack into it, 
remove buttons and connect you computer to it,
say using the parallel port.

I'm looking to do the same thing. Why didnt they make a wireless
option for the robomower. Driving that manually is slow and you look
like a fool following behing a yellow mower.
By the way the new robomower1000 has gps I think as it drives itself
to and from  the different zones from a docking station on its own.
If you find anything I would love to hear it.