The ABL procedure you want to run is a parameter to the Progress executable ( prowin32.exe - GUI, _progres.exe - CHUI ). You invoke the executable and supply the parameter accordingly. They are Unix-style and they are case sensitive.
Code:
prowin32.exe -p your_procedure.p
You should be aware that there might be other parameters you need to supply. Most prominently for example the database connections if the procedure needs one.
Heavy Regards, RealHeavyDude.