[fpc-pascal] Can a program find out how it was started?

[miller at psy.otago.ac.nz]

Greetings from New Zealand,

I use fpc to compile programs intended to be run from the command line in a cmd
window (Windows 2000, etc).  Sometimes, though, new users try to start the
programs by double-clicking on the exe file (application icon). When the
program starts, I would like to be able to tell if they have done that,
so that I can present a special error message.

So my question is:
  Is it possible for a program to tell whether it was started from
  the command line or started by double-clicking on the application icon?

I tried checking ParamStr(0) and DOSVersion, but these have the same values
regardless of how the program was started.

Any suggestions?

Thank you for your time,

Jeff Miller