passing variables

I know this is a simple answer but being unfamiliar with phprunner i need some assistance.
I'm trying to pass a selected field value from a list page to another add page. I've tried to insert a button and on the server tab pass the $keys[0][field] to the html reference and only got a null value passed....
i know there is a simple solutions but I've spent hours looking through the forum... any assistance is much appreciated.
i.e. on the server tab of the button if i put in

$result["txt"] =$keys[0]["message"];
i get a null back