hi Peter,

 PF>  hl> fflush(stdprn); close(dup(fileno(stdprn))); should do

 PF> stdprn (and stdaux) are not supported by os/2 compilers.

This first lines of the message you quoted, read:

 MG>    My DOS programs under OS/2 are not printing until the program
 MG> terminates. The statement:                        fprintf( stdprn,

He isn't using an OS/2 compiler (or maybe Watcom has one to produce DOS
programs?  Then it should support stdprn and stdaux, or he would have
another problem).

regards,
         hugo