Copy app from laptop to laptop without actual app (WinXP Pro) on both

[spunky92958]

I would like to copy an application that was installed on one laptop to another laptop without having the actual application. I know there are files (DLLs, etc.) which go into several different directories and that the registry gets updated with the app's info.

I know I can copy the directory under "Program Files", the obvious files from the System32 directory, and everything obvious in the registry, but I know I might not get everything I need.

What utility finds all information installed on a PC/laptop when an app is installed?