I have finally managed to get Backtrack 3 to download packets from my home internet connection which uses a WEP connection, but it does it quite slowly as there isn't any other clients. How would I be able to reuse the .cap file that is created when I start airodump? Or when I start aircrack would I just have to type "aircrack-ng -b <mac address> dumpfile*.cap" and it would reuse all the .cap files that starts with "dumpfile"? I am running Back Track 3 from a USB stick, would the dumpfile-01.cap file still be there next time I load it up? Thanks for your help.

edit - Also, a couple of unrelated questions, is it possible to update aircrack on the USB stick? Or do I have to have it installed on my laptop?