Is it possible to have a workbook to open on its on instance, and not allow other workbooks to open on it?

I have been searching around, found the code bellow,, but not sure how "Continue_Open" sub (that would be called from WorkBook_Open... that would be Called). 

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WorkBook_Open should call this subroutine (but only after it has been opened on it own instance).

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Thanks

Ernesto