You are right in that it appears as though the perl I am using was compiled with iThreads. When I check the configuration summary with "perl -V" I do see "useithreads=define". My next question then is "Where can I find some documentation on how to use it?". There is nothing in the perldocs in regards to it. At least nothing that I can find. I have also poked around on the web and what I do see is sketchy at best. Thanks again......