Harry, > Look at the script. It is actually doing an IGNORE and a block. You're right. Assuming the code is correct (I don't know Perl all that well) then this would mean that SIGCONT can't be blocked -- something that I've not been able to find in the UNIX standard. I don't like depending on undocumented behavior -- not for something that needs to run on any UNIX-conforming system. Do you see anything wrong with making decoders their own process-group leaders? Regards, Steve Emmerson Ticket Details =================== Ticket ID: ORI-704946 Department: Support LDM Priority: Normal Status: On Hold