• Applications designed for the Apple II Plus won't recognize lowercase characters. Press Caps Lock and the application should run just fine.
   
• The Apple II Plus didn't have Delete, so applications designed for it won't respond when you press Delete. The application will tell you some other way of deleting characters. (Usually it will involve pressing Left Arrow.)
   
• The Apple II Plus didn't have Up Arrow or Down Arrow, so applications designed for it won't move the insertion point up or down when you press those keys. The application will tell you some other way of moving the insertion point up and down.
   
• Applications designed for the Apple IIe or Apple IIc may refer to a Solid Apple key or Solid Apple. This key has been replaced on the Apple IIGS with Option. When an application tells you to press Solid Apple (usually in combination with some other key), press Option instead.

The Apple IIGS supports a super-high-resolution graphics mode that differs from earlier graphics modes in the concentration of dots and the range of colors that can be assigned to each dot.

Applications designed for earlier models of the Apple II will-work fine on the Apple IIGS, but won't use the super-high-resolution mode. They will use low resolution, high resolution, or double-high resolution.

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Appendix C: Apple II Family Differences