Compaq Armada 7400 Reference Manual page 99

You need communications software to operate the modem. Such
software issues commands to the modem, including modem
connection speed, the number of rings before answering the
telephone, listening for a dial tone, and dialing a phone number.
For information on controlling the phone dialing sequence, refer
to "Dial Modifiers". The internal modem, for example, includes
the ability to wait for a "go ahead tone" after dialing a credit card
number as part of the dialing sequence. To do this, add a $ symbol
at the appropriate point in the phone number string.
There is a wide range of communications software available that
can be used with this modem for tasks such as accessing your
computer from a remote location. Contact your Compaq
authorized dealer, reseller, or service provider for a complete list
of communications software applications.
If Hibernation initiates or a low battery condition
occurs while your are using the modem with communications
software, the modem will disconnect. Exit Hibernation or resolve
the low battery condition, then restart the communications
software to restore the original modem settings.