What response Adobe Acrobat/Reader gets back after submitting form to a PHP script

Question

Hi, PDF experts help needed,

I am posting a form from PDF to a PHP script with Adobe Acrobat.

I would like to set my PDF to display appropiate messages based upon some returned values. So I am looking for returned values... if there is any returned values after posting the form, how can I access them? Maybe, there is an option to set this in Adobe?

Another thing: When the PDF form gets submitted and let's say I echo back a 'thank you' message from my form-handler PHP script, a new PDF gets created and opened displaying my message... is there a way to open that new message in the same window and close the form instead?

Thanks,

Laz