If the email is the one your internet service provider gives you when you sign on with them, the only way to do that would be to set up a web account with POP3 capability and have your emails filtered over to the web-based email program, allowing you to access it anywhere.
If it's just a web-based email client (hotmail, aim, gmail, etc) then you can already access it from any computer. Just type in the web address and fill in your email address and password.
lolz :D Is this some kind of a joke? :D
Signing in is signing in. You do it the same way from any computer :D lolzCancel aol mail??