There's script-kiddie stuff out there to help you reverse-engineer stuff and break passwords... just use google and look for hack + crack + your messanger program you're trying to reverse engineer, and download the programs that come up. Most of them include wonderful little backdoor programs and nasty little trojans... so do it on a box you don't mind reformating. I've found that even the most obscure programs out there have been cracked by people eager to get a backdoor into many people's systems.