In *nix, Linux, or Mac OSX by using the nice command, which is where Win2k and XP got the idea in the first place ;) (Dunno how? In OSX, go to Utilities in Applications, pull up Terminal, and before you do anything in that terminal, type man nice to get a quick and dirty manual on how to use the thing.) Something to consider, though... back when I used Windows, I had noticed that when doing a render in Vue, I had to actually throttle down the process for Vue, else my music began to choke. Poser OTOH didn't require that, but if you start jacking up process priorities it does come at the expense of other things (and if you want to lock up your machine nice and hard, jack that puppy up to "Realtime" in 'doze...) /P