Alaska's Gold was developed through a grant from the National Historical Publications and Records Commission by the Division of Libraries, Archives and Museums, the Alaska Dept. of Education and Early Development. 1999. All rights reserved.
DM is a texting acronym that means Don't Mind. The acronym means Doesn't Matter. Also is an abbreviation meaning Direct Message.
As an abbreviation, it could mean anything. Usually it's a small computer (personal digital assistant), and in that case I say handheld, no matter what actual type it is. I would just ask them. If you follow the links below you'll see they can be damm near anything.