Unless it is the key field, you should never need to do that. If it is a key
field, there should probably be a form/subform relationship which will
result in 2 textboxes. If that's not the case, can you explain what you are
trying to do?
By using appropriate code or expressions... if you in fact want to do this,
which I would try to avoid. It's always much easier to put two different
things together than to split something apart (without breaking it!)
What will the user be entering into this textbox?
What are the two tables and their fields into which you want to put it?
WHY? don't you have the user enter into two textboxes to start with?
