Where do I put the modem init string?

This really depends on the program. Check the preferences or options menu items to find a place for the string.

To add an init string to Windows 95 Dial-Up Networking, click here. To edit the init string in a Mac CCL modem script, click here.

One excellent resource is the 3Com Software Setup page. It includes instructions for configuring nearly a hundred popular PC and Mac programs.

Next question: Where can I find other modem init strings?