How can I program my own externals?

Mark Hanrek's "XCMD Shell" makes it relatively easy to write for first-time C programmers, and is available for both Symantec C and MetroWerks Code Warrior. The Hanrek XCMD shell is available via FTP from the Fourth World site: Code Warrior: Think C 7.0: Royal Software's CompileIt! product is another option allowing you to write your external using HyperTalk. Royal Software can be reached at .