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Agree, but it's pretty clear this is someone learning PHP who is perhaps doing coursework. Writing code of this sort would not be viewed kindly in any professional environment where there are code reviews.

We couldn't possibly guess, without knowing what your pro.php script does to store the data you submitted to it.

Hey, @Psycho, haven't I seen this plagiarist's comment somewhere else?

Depends on how do you want the site to remember - as in what mechanism saves the data. Because it has to be saved somewhere. For example, there's a session for saving information that you want to use on the rest of the site. And there's cookies for saving information on whatever specific device the user has at that moment. And there's databases for saving virtually anything for any reason. So for you to decide where you store it, you'll first have to decide why you want to.