Something like this should work:
DECLARE INTEGER ShellExecute ;
IN SHELL32.DLL ;
INTEGER nWinHandle,;
STRING cOperation,;
STRING cFileName,;
STRING cParameters,;
STRING cDirectory,;
INTEGER nShowWindow

? ShellExecute(0,"open","c:\acrobat3\reader\acrobat.pdf","","",1)
? ShellExecute(0,"print","c:\acrobat3\reader\acrobat.pdf","","",1

Best Wishes