"Test this axis/Run", and a limit switch

When using the "Test this axis" window, and the "Run" command, does operating the limit switch stop the motor running ?
In other words can I use this to find the correct settings for the limit switch for each axis ?
At the moment, it has no effect, and I don't know if it's because the setting in the parallel port window is incorrect, or if I have another problem elsewhere.
John
__________________
"It's like doing jigsaw puzzles in the dark"

Thanks John, you have confirmed my suspicions and that of another on cnczone.
Regards
John