Get parent program name from child program

What I am trying to do?

Get the name of a program that originally called child program (which is .p program)

Scenario

I have a program called WebView.htm which calls GetData.p program. GetData.p needs to know which program it was called from. One way to do is to pass a program name explicitly as a parameter when calling GetData.p. But this raises a concern in my scenario because I have about 200 web pages that I would have to modify in order to add this new parameter. Is there another implict way (may be a Progress built-in module) that I could use to get the parent (i.e. caller) program name from within GetData.p program.