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Here's how to set up things so that a tab key tells the command process to attempt to complete the last word typed.

1. Start RegEdit.
2. Seek to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor.
3. Double click on the value 'CompletionChar'.
4. Change to 9. This is the ASCII value of the TAB key.
5. Click OK.

To check to see if the changes work, start a command shell. Type "dir pro" and hit the TAB key. The line should change to dir "Program Files".

If the path specified matches more than one subdirectory then additional TAB keys will replace the expanded path with the next match.