Setting a PassKey - can errors be caught?

[Marty Knapp]

I just realized that I posted my question under the wrong subject - 
sorry about that. So I thought I should re-post:

When setting the passKey of a protected stack (via script), is there a 
way to catch if is valid or not? I made a change in the password of some 
of my stacks along the way, and so there are two possible passKeys (real 
smart I know . . .). If there's a way for me to try one, then if it 
fails try another, I'd be a lot happier today! My guess is that it can't 
be done, but maybe? BTW these stacks are in the hands of my users. 
Locally it would be no problem to fix, I know.

Thanks,
Marty