Palm VIIX Handbook page 16

Serial (COM)
port door
Important: Your handheld requires a dedicated port. It cannot share
a port with an internal modem or other device. If you are
unsure about the location of the serial port on your
computer, refer to your computer's documentation.
Page 8
Protects the serial port that fits into the connector
of the handheld cradle. The door ensures that the
connection surface of the serial port remains clean
and clear of debris.
Note: When your handheld is in the cradle, and
the cradle is connected to your computer,
you can use HotSync technology to do a
two-way exchange of the data on your
handheld and your computer. Plug the
connector of the cradle into the serial
(COM) port, as shown in the following
illustration.
Introduction to Your Palm VII™ Handheld