Can anyone help me on a few problems using m. memory variable for scatter & gather command ?

Problem
=======

1. where should i create the m. memory variable in a form ?
2. should i create the m. memory variable as public or private ?
3. i have tried to create the m. memory variable as public in the
load event and it work fine. The problem came when i run the same
form the second instance. Any changes on the m. variable in the
second instance will also reflect on the first instance. If i
clear the memory on the second instance in the unload event, the
first instance get an error saying variable not found.
4. i have tried to create the m. memory variable in the init event
but some objects that reference to the m. variable does not
recognise it.

Can anyone teach me how to setup the m. memory variable in the appropriate way in a form ?

Thank you in advance

Alaster Leong