yeah well peerweb DC++ is the new in thing in college so almost every one on lan has it .. and well we use it only for our internal purposes and more and more for internal chating and all than for actual file sharing .

as for somthing listening on port 21 it seems so but then why does that prompt always close down either after the first charecter i type or after a specified time of no actvity (maybe some timeout setting) he shouldnt have anything running on that port cause well ... he hasnt set up any server or anything and i think he's got macafee so decent firewall and all ... although i know that it doesnt make him invulnerable but some protection ....

but yeah you did manage to put it put it down pretty well ill give you the result of that nmap scan as soon as he gets back

edit :
ok heres the result .. saved in the screenshot ..