Operating System: Unix or Linux (Note: might work with other versions of this os.)
If you do the install as given then it will install the driver for the current boot session. You will have to add a line to one of your system rc files (probably in /etc/initrc.d would be best) to get it to load at boot time.
Once loaded you can use /dev/modem just like a normal modem on a serial port. I used kppp to get a connection up and running and uploaded this file during that first session...