Boolean variable initial state

Ok, time for an easy one

Are Boolean variables ALWAYS initialised as FALSE when they are created?

I am wanting to leave a 'marker' in a function so that I know whether it is the first time it has been used or not. Something similar to this:

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This will work if I can rely on the fact that 'BeenHereBefore' is going to alway be initialised as FALSE, but I just wanted to check that was the case

Cheers!

Edit
I should have said, obviously the above Sub would be called repeated from another routine.
Also I know that STATIC will cause it to retain it's value when this Sub is exited, but once all Subs have been exited and everything stops, if i was then to run the macro again would this variable reinitialise back to FALSE, or keep it's TRUE setting from the previous run?

Yes they are, in every current version of VBA.
It will remain True until you close the workbook and reopen it, or unless you run an End statement somewhere in that project.

Many thanks RS