How to invoke plsql block when press a button

new to htmldb,
let's say i have a form with some items , after i press a button, i want to invoke a plsql block, how can i do that?
Cheers,

I have only played a bit with this. I had a region with search criterias and a region based on a procedure. I created a page button on the first region that branched to the same page. When I press the button the page is refreshed and the procedure is re-executed with what ever search criterias the user has keyed in. That is as far as I have come :-)

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>
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How to invoke plsql block when press a button

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