I just noticed that I can copy/move a file to child of the current directory simply by entering the childs name and if it doesn't exist it will prompt to ask you if you want to create it. But single letter children are interpreted as a drive letter and so won't work.
eg a file c:\path\123.txt can be copied/moved to c:\path\child\123.txt by entering child in the To input path.
If I recall correctly this was introduced mainly so that long paths that are identical on two or more drives can be generically recalled and quickly edited.
Anyway, I now can say my knowledge of ztw has risen from 80% to 80.00000001%
Cool
Steve