Impossible to give a general answer, since it depends where the program
stores its binaries, settings and data.
For example, Firefox can be copied from one Program Files folder to another
and will work straightaway. If you also want the config and user-files
(cookies, history, etc) transferred, then you need to get these from under
the user's Application Data folder. Firefox makes no significant use of the
registry, other than making itself the default HTML handler if requested.
Many programs make use of the registry to a greater or lesser extent, and
it's then down-to finding-out exactly what is needed. Some also dump stuff
into the "Common Files" folder. These kinds of programs are much more
difficult to transfer.
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