Good afternoon sthiru
All you need is an entry in the register. It doesn't have to be anything other than, say, "1" or "2". Or "Fred" if you prefer.
All your add-in has to do is look in the registry for that entry and run the add-in if the entry is there, or halt execution if it's not.
The VBA framework provides a relatively easy way to write and read registry settings. You will need to learn how to use "SaveSetting" (to write) and GetSetting (to read). Beyond that, it's not that hard.
HTH
DominicB
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