Restoring Keyboard and Mouse Connections

[Hal Vaughan <hal@thresholddigital.com>]

I have a KVM, the older kind, controlled with a rotary switch, that I use on 
several systems.  The keyboard and mouse connections are PS2, not usb.  If I 
switch to system C and have to reboot or power down and don't get the switch 
back to system A or B fast enough, then I sometimes lose all mouse and 
keyboard response on A or B or both.  I can still connect to the systems by 
ssh.

Is there any way, through ssh, that I can get the system to start reading the 
keyboard and mouse again?  Is there some service I can restart or something?  
I'd really like to be able to reactivate the connections without having to 
reboot.

Thanks!

Hal