What would be the equivalent of the PHP isset function

I am looking for the equivalent of the php isset function in order to determine if some variables were previously set using the jsp:set tag.
Another thing which I can<t figure out is how to procede to determine if a form has been submitted, and if it has, how to retrieve the button name used to submit.
Thanks in advance.
-Dalzhim

I have found out that I didn't receive the button information because of a weird behavior of Internet Explorer since that problem didn't occur with Mozilla or Firefox. It would seem that when pressing Enter when you have the focus into a field under Internet Explorer sends over the POST Data without the information of the submit button as opposed to when you simply click the button with the mouse.
I guess I am right saying IE misbehaves in this particular case as I am more enclined to trust Mozilla which doesn't present this problem but if I'm wrong I'd like someone to point out why.

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