Move the cursor from the command line in fvwm using FvwmCommand

In the holodeck, I sometimes forget to move the mouse pointer to the corner of the screen before I unplug the keyboard. Here's how to do it remotely if you use fvwm (or fvwm2) as your window manager:

$ ssh whatever

$ export DISPLAY=:0.0

$ FvwmCommand 'CursorMove -100 -100'

Note that the quotes are important; otherwise it gets confused about the -.