Understanding How Access Sorts Records

Greetings,

I'm hoping that someone can help me understand the method behind MS
Access' ordering of records within a table. It does not appear that
the records added last are always at the bottom when I open the
Table. It is important that the records stay in the order in which
they were added to the table. They clearly are not, but I can't seem
to figure out why the records are ending up in the order that they
are. Can anyone shed some light on this?

Thank you very much!

Mike
.