I have developed a REXX script that works with OS/2 Warp v4 (and possibly Warp Connect v3) and its freeware. The script uses another freeware script that I have included in the archive. Once the script is installed and running on your computer, all you have to do is call your computer via phone and hangup after the first ring. Then, within 3 minutes (barring busy signals your computer might get) your computer will be connected to the internet. The computer will then run a command of your choosing. One included command will email you the IP address that has been assigned to the computer. Another will upload a web page with the IP address and links using the IP address. With this IP address, you can use telnet and ftp to comunicate with your computer remotely.
To have your computer disconnect, you can either let its netowork connection be idle for however many minutes you set it for, or give your computer the "pppkill ppp0" command from the command line using telnet. My script will then wait for a phone ring again.