Capture filename pointed by mouse

I read a program that uses the shell function `DragQueryFile' to get
the folder name. Can I use this function to capture the name of object
(file, folder, control panel item, net neighbor, ..) in Explorer and
on desktop?

If I want to work with Explorer.exe, I need to program an shell
extension; If I want to work on desktop I then need a global mouse
hook, right?

Where in the Registry do I register my program to monitor mouse move
event and capture file or folder name when I put mouse cursor on it?

Is cmd.exe part of shell in Windows 2000 and later? If I execute a
move command on a file, can I monitor this movement with a shell
extension program?

Thank you for your time