Of all those idea's I see the most potential in the nudgestoolscript and the notifier for opening a window (don't know if there is one) even if u opened it yourself maybe you could combine this with the close window notifier so if u send a nudge they would ignore it and close the window although if they just leave the window open and ignore u... it doesnt work.
doesn't msn send u a confirmation if the message u send is received on the other side? so i'm thinking maybe u should use the nudgesscript to send a nudge and use the confirmation check if they received it, cause if they are really offline they would not receive it.
this is just an idea of mine, i'm new here so what do u think? is it possible?
I, also read on another site that u can't send file's to people who are offline but u can to people who are appearing offline, but i think this is inaccurate. but maybe u should give it a try.
btw. sorry for my bad english but i'm to lazy to write this all correct