A common interface for multiple window computers
Kenneth I. Magel · 1986
A common interface for accessing the features of the Macintosh, Amiga, Atari ST, and other GEM microcomputer is presented. This interface appears to the programmer as a set of subroutines, but is actually implemented primarily by a preprocessor which converts the subroutine calls into calls of specific ROM of operating system routines on the target machine. The window manipulation portion of the common interface is described.