How to prevent multiple instances of the same database from opening

I have a database that when I or my users click a bookmarkto launch it, it opens a frameset with a tab showing at the top.

But if I double click the bookmark, it opens two instances of

the frameset with two tabs showing at the top. If I continue

clicking the bookmark, it opens more instances of the db.

We have bookmarks for other databases. This is the only one

that opens multiple instances.

How to fix this problem? It will confuse users and cause conflict. Please help!!!

Subject: How to prevent multiple instances of the same database from opening

You could add some code in the databasescript, that reads a profile document. When available close yourself. When not, add the profile document.