Hey Carmine,
I do not have any of the older versions of TestStand on my machine, but there are online help files that explain the Optional TestStand Engine.
For instance, here is the help file for the TestStand 4.0 version:
TestStand Engine Options Dialog Box
If you are looking for another version, you could look in the help file of the TestStand you have installed.
Regards,
Jake G.
National Instruments
Applications Engineer