NEC MobilePro 790 - Manual (Page 29)

1-22 Getting Started
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Power off, then power on the MobilePro unit.
Using other Communication Devices
During synchronization, the PC Connect (serial) cable must be connected
to your host PC. However, you must disconnect the serial cable before
using the internal modem, IR port or a network card in your MobilePro.
Connecting Remotely
In addition to using your MobilePro as a companion PC, when you travel
you can connect by modem directly to an internet service provider or a
network remote access server, to get email and to view web pages.
Refer to Chapter 5, “Setting Up a Remote Connection” for details.