don't like postin in ancient topics but since this guy already brought it, and nobody really answered it, here it goes.
Basically the "login" command in the command prompt executes the Login.cmd file which is in the system32 folder. Since MS got rid of the GUI telnet client (windows 98), this is how your supposed to use it now. But you can edit the Login.cmd file to execute any telnet client you want. Also you can change the banner it display and other stuff. Open login.cmd in Notepad and play around with it.
I KNOW EVERYTHING. ASK ME.