Seeing as Topclass for linux, and for Solaris, uses threads (pthreads in the linux case), can anyone give me guidelines as to good starting books on threading under UNIX, and performance tuning? (Next thing I'll consider being a programmer <g>) L. --- Liam Bedford 01-4170153 System Administrator WBT Systems, Block 2, Harcourt Ctr., Harcourt St., Dublin 2