For example, it can run a Macintosh application which calls Unix system functions, or a Unix application which calls Macintosh Toolbox (such as QuickDraw) functions, or a HyperCard Stack graphical frontend for a command-line Unix application.
It can run a Macintosh application, or a Unix application-line Unix application. This is for example. This Unix application calls Macintosh Toolbox (such as QuickDraw) functions. This Unix application calls a HyperCard Stack graphical frontend for a command. This Macintosh application calls Unix system functions.