Jay - that means that when Setiqueue sees a VLAR WU (very low angle range WU), it will try to redirect it to an OS (clients/queues are identified by OS) that will run it the fastest. It is known that there is a bug in the 3.03 CLI that makes running these very slow on windoze 9x/ME. Thus if you are running SETI on linux, it'll direct the VLAR WUs to that machine. Similarly, Setiqueue can try to send these to windoze NT/2K/XP since those OSes run VLAR WUs a little better than 9x/ME (although still slower than *nix or MacOS, etc).