Hi, Susan,
What David says is correct. If you're using OE8.1B, you can use the Column Editor to add these fields to your Order/Invoices/Credit Notes grids.
To answer your question about specs, use the E codes. Codes E48 thru E51 will print the 'last printed by user' for each document type information. In OE8.1B, E56 prints 'created by user' and E59 prints 'last modified by user' information on specs.
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Regards,
Softrak Tech Support