Gridengine currently has the "AND" operator job dependency: A,B -> C ie. we need to wait for job A and B finish before we start job C. There are discussions on the SGE dev mailing list about adding the OR job dependency: A|B -> C So job C will start as soon as job A or job B finishes. I am wondering if this is useful in bioinformatics job flows?? Rayson __________________________________ Do you Yahoo!? Yahoo! Mail - Easier than ever with enhanced search. Learn more. http://info.mail.yahoo.com/mail_250