The "Brandor" virus (which is less than 6K in size) generally arrives on your Pocket PC via e-mail. It then opens the ports it needs and sends your IP address to the virus's author (who is probably 48 and still a virgin.) Once that process is complete, your Pocket PC is "owned" and can be remotely controlled.
"WinCE.Brador.a is a full-scale malicious program ready to go. Unlike proof of concept malware, Brador has a complete set of destructive functions typical for backdoors."