Many people use special characters to write their MSN or Windows Live Messenger display name. Any idea how to do it?

Me and this girl from Greece have been talking on MSN and she sent me a letter in English. I want to send her a letter in Greek and maybe even talk to her in Greek on the phone. Do you know of a program or book or something that will work efficiently to learn Greek?

Learn greek???

Hey! i reallly want to learn the basics in greek, i used to know bits of the language but i seem to have forgotten it all, just wondering if anyone would be able to help me on msn or something?? i learnt dutch through chatting with my friend and i found it relatively easy, let me no if you can help me x
haha yay about the name... im guessing you cant help me then lol