Launchpad showing multiple instances of some apps

Anyone has the same issue?
I use external USB HD for Time Machine backups of my Data partition and for daily clones of System partition done by SuperDuper! - Launchpad is showing all instances of applications, not only these in the Applications folder on my Mac, but also some from Application folders on the attached clones - as result I see multiple instances of each application, without indication which one is on the running system and which ones are on the clones.
After disconnecting the extenal USB HD the duplicates still remain in the Launchpad.
Any idea how to deal with it?
Any way to refresh the Launchpad?

The LaunchPad can be refreshed like this:
press cmd-shift-g and enter there '~/Library', then navigate to 'Application Support' and open the Folder labeled 'Dock' and move the .db file to the trash and now open the Terminal and enter 'killall Dock'.
The problem you have is probably coming from your the SuperDuper! clones… so be sure to remove the external HD first.
enjoy the Lion

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Hopefully, there is someone with a programming background who
can take me and other who have posted similar questions through
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Well, I do have a programming background, and I must say that it amazes me that someone might want to do what you did to “solve” a problem that IMO doesn’t exist.
What exactly is it that you expect to accomplish by running multiple instances of Mail, and for which neither (1) organizing your mail using multiple mail accounts, custom mailboxes, rules, and/or smart mailboxes, nor (2) setting up separate user accounts, are acceptable solutions? I just don’t get it.
I've seen many questions regarding the possibility of running multiple
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I haven’t. Could you please provide a link for such a question, preferably one asked by someone who knew how Mail and Mac OS X work, i.e. a link for a case where there really was such a need?
There seems to be much good reason to be able to do so
I know of no such reasons, neither good nor bad.
i.e. separating work and private mail
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Maybe if you tell us what exactly is the problem that you’re trying to solve, instead of focusing on a convoluted “solution” that doesn’t work, we could propose a solution that does...
and very little bad reason to do so
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It also seems that it should not be so hard to do.
I wonder what makes you think so. It does certainly seem hard to me, so hard that I don’t even think it can be done without breaking something, if at all...

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