How to store the return value from a select list in page item ?

I'm sorry, I'm sure you will all flame me for this (and its long too :-(. I'm still trying to pick this up and havn't had time to read manual and this forum and up against the clock (as usual), but this must be something thats simple to do, otherwise why have 2 cols on LOV (display text and return value.
normal kind of thing - master /detail, a master table and a detail table, master.id is PK in master, master.name is the name of the master item. detail.id is pk in detail, detail.mid is foreign key to master.id. I have a tabular report that displays a join of cols from master and detail, with 2 cols being links, one is a link on master.name, that passes master.id to page P1 and it displays a row from master. The other col displays detail.name and passes detail.id to page P3, P3 displays a row of the detail table.
I want to populate a LOV with possible master.name values, but display the name of the current P3_MID value (from detail.mid). Then a user can pick a different master and it needs to update P3_MID so on submit it updates the row.
I just can't seem to see in the manual how you can specify where the return value on a LOV goes?
As I said, sorry for long post and not having had time to read docs correctly - someone just point me at the subject matter somewhere, please.

Sorry, I was trying to be to complex and obviously APEX is just too damn cleaver - I figured out how this works - basically APEX pulls the LOV and then matchs the mid to it to display the correct name - simple and easy - just me making it difficult

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