Logging into a Vista PC on a domain as a local user when you don't know the computer name

If you're logging into a computer that's on a domain and you go to "Switch User", it will try to log you in as a domain user.  So, if you want to log in as a local user, you have to specify that.


However, there's no "Log on to" drop-down box anymore, so you have to type the computer name followed by a backslash in front of the username.


Okay, but what if you don't know the computer name?


Aha!  There's a shortcut.  Instead of the computer name, use a period (.).  That's right, a dot.  A dot is shorthand for "where I am now" in UNC paths, DOS and UNIX/Linux.  So, you type the username like this:


.\username


Voila!