Bind combo box to primary key but display a description field in Access

Question: In Access 2003/XP/2000/97, I've set up a table that contains an autonumber field as the primary key and a description field. I want to be able to create a combo box that displays the description, but stores the primary key. How do I set up the combo box?
Answer: Quite often the primary key value can mean nothing to the user. Instead, there is a description field in the table that relays the meaning of the record. In Access you can link a combo box to the primary key, but display the description in the combo box itself.
To do this, first create a combo box object. Right-click on the combo box and select Properties from the popup menu.

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Question: In Access 2003/XP/2000/97, I have a form that is bound to a table. I have created a combo box on this form that obtains its values from a field that resides in a different table from the one that the form is bound to. When I enter values in this combo box I want those values written back to the associated field. How do I setup the combo box so that entries in the combo box are written back to the field in the table it came from?

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Question: In Access 2003/XP/2000/97, I have a combo box that is populated from a table/query. How would one add an item to a combo box via popup form if a user enters a value that is not in the list?