going back in time

[Andrea Crotti]

I was just wondering if there could be kind of undo operation for higher
level problems.

For example now I just installed ruby-tests.el from emacswiki, which (I
saw too late) unfortunately has some "global-set-keys" with combinations
that normally I use for other things.

Is there any way to revert back to the last global state (it might be
useful also in other cases of cours)?
Thanks