Tab Completion

Not too long ago I found out that Windows XP and Server 2003 has "tab completion" in the command line. For example, if I open a Command Prompt, go to the root of the C:\ (cd\), then type "cd prog" and hit tab it completes the name of the folder that matches, in this case "cd 'Program Files'", you can then use a "\" character and type the next folder or file and press Tab to complete the next one. Nice.