Has anyone any experience of using one of dual processors for manipulating fractals? I found this URL: http://www.harmony-central.com/articles/tips/dual_processing_system_tips/. I'm using an AMD Athlon 64 x 2 at 2.19 Ghz with 1 Gb of RAM and XP Media Centre Edition. I followed instructions to start up a second Mersenne Prime Search on the second processor, and all seems well... both of them are hacking away. The key to this setup was to run a second copy of the software with a "-A1" command line argument. Now I don't know if the "-A1" is part of the prime search software or part of the Command Line structure of XP Pro... so far I havn't been able to find this out. I don't want to screw up my setup by trying it with the DOS version of Fractint and the Fractint for Windows Beta poses me other problems.