No, you do not.
However, it is difficult to set something up without being able to see what
is happening. You could boot both machines and move the display from one to
the other to set it up , verify setup and ensure everything is working.
After it is working, use the display for the machine you want to use.
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I thought so, as I was trying to do this. It was really a pain. One computer
sees itself, mainly I think, because the other computer is off. I can't have
them both on at the same time with just one display. So they can't 'shake
hands' as it were. The other machine which is XP, says its disconnected..again,
I'm assuming its because both of them are not on at one time. How can one
verify that all is well, considering this scenario? Thanks btw for answering