A mobile user is one who works from multiple locations and sometimes works in Notes while disconnected from the Notes network. Non-mobile Notes users typically just turn on Notes and start working; they never have to think about how to connect to their servers.
As a mobile user, you have to decide as you move from place to place or from computer to computer how you will connect from that place or computer to the Domino servers where your data resides. Luckily, you will probably connect in only one of two wayseither to the local area network in your office or to the Internet. But you may have to decide whether to make that connection using your computer's wired Ethernet adapter, its wireless Ethernet adapter, or its modem adapter. And you may have to figure out how to dial a long distance call from a hotel room. And you may have to decide whether to work with databases residing on the server or locally.
If you use one computer at work and a second computer at home, you have to think about how you'll keep the Personal Address Books and personal journals on those two computers in sync with each other. Luckily, Notes takes much of the pain out of all of these decisions. And hopefully your administrator did the basic setup for you.
As a mobile user you may have to make sure of the following (especially if you will be traveling):