How can I programmatically set the main program prior to building the exe?

I am using this to build an exe
build myExe from myProj recompile

but I would like to be able to switch the "main" program to build another EXE located
in the same project.

I have found this Object.SetMain([cFileName]) in help but am not sure how to
create the project object in the first place.


Thanks
Steve