I was trying to diagnose the cause of a script problem in this thread when I decided to check my Activity Monitor. I saw a strange process, with a process name of (null), using ~300 MB RAM and ~1 GB virtual memory (far more than any other process). It had 13 threads. I wasn't sure what it was, but I suspected it had something to do with my experimenting. I restarted the Mac and checked Activity Monitor again - the (null) process was gone. What I was trying to do was see if I could get the perl command-line program to execute a script (with a .pl extension) by Option+Command-dragging the script to the perl executable. I tried that twice, and nothing happened. Any ideas as to what was going on?