What is a PMP project?
As for Turbo Pascal and Delphi, there is a Main Program concept.
In Delphi you have a project descriptor (.dproj) and a main program file (.dpr).
In PMP the project file (.pmp) is a kind of .ini file that stores all the current status and options of a project.
In PMP the main program is a normal file (.pas) that is assigned to be the main program file in the project's options dialog.
Once the main program file is assigned, at least it is enough for PMP to be able to compile.
See also: My first PMP program.