connecting 2computers to monitor

@lolbox,

Ah...no, never tried that.  I suspect it would pick one input signal over the other and simply ignore the other.  Some monitors do have built in input selections ability thru onscreen menus.

@bt1942,

You connect keyboard/video/monitor to the KVM using the existing cables.  Then, usually, the KVM comes with two other sets of cables that you connect from the the KVM to each computer.

Here's a good picture:
http://www.idevelopment.info/data/Unix/General_UNIX/KVMSwitchesForTheHomeAndTheEnterprise/KVM_Switch_Configuration_Example_large.jpg