should be easy to do file sharing over skype when you have the receiver's ip and an open udp port through the firewall. maybe someone will release an app. can the mpaa sue microsoft?

this is not an "exploit". as the man says, your IP is being sent out to the network. others on the network are using your machine's resources. that's how skype works. he's just showing you this fact.

zsh is relatively large compared to bash. and bash is large compared to sh, rc, tcsh, etc. if there are space and memory constraints, size is relevant.

the path to "user-friendly" shell nirvana (i.e. interactive use, not scripts) can be achieved through use of a library like editline, without installing a huge, "kitchen sink" package like zsh... if size is an issue. make the shell cmd line behave like the editor you know well.