According to YUKSEL TURAN:

I wanted to use a C library to use Motif with my pascal program.To do this, I had to pass some callback functions to the C part.I tried pointers but it didn't work. So did procedural parameters.

Normally, both should work. What did you try exactly? Please send some example code, and cite the documentation how the C library wants the callback function to look like. Greetings, Peter Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski@uni-essen.de - http://home.pages.de/~peter.gerwinski/ [970201] maintainer GNU Pascal [970510] - http://home.pages.de/~gnu-pascal/ [970125]