connecting two pcs together

[RalphG]

I have tow a full size pc and a laptop I joined the together yesturday and they worked.
wever when I tunred on one of the PC did not work. Note the key board lights on the
monitor work.
could somr one he please help.

RalpkG

 

[Mark Phelps]

Might help if you described how they are "joined together".

Does this mean some kind of KVM switch plugged into both?

OR does this mean a crossover networked cable plugged into both?

OR, something else?