This is a follow-up to an email that I posted yesterday and that Fawzi replied to. There are two places where one can print the forces to standard out. &FORCE_EVAL&PRINT&FORCES and &MOTION&PRINT&FORCES I've only manage to get the former one to print forces to std_out. The latter one always gives some I/O error. Just FYI. -- Nichols A. Romero, Ph.D. 1613 Denise Dr. Apt. D Forest Hill, MD 21050 443-567-8328 (C) 410-306-0709 (O)