They can only draw a single window, which by default is given a special round-bordered appearance. Although the system software does little to specifically support them, the popularity of Desk Accessories led many application developers to ensure good cooperative multitasking support even from the early days.

Switcher

Andy Hertzfeld, one of Apple's original Macintosh software architects, wrote Switcher after seeing John Markoff use a terminate-and-stay-resident program

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