Some programs, like children, should learn to clean up after themselves. The worst offenders are programs downloaded from online services. For example, America Online subscribers can download a new "preview" version of AOL Windows software that gives you access to the World Wide Web through a nifty browser. But when the program finishes installing itself, it leaves behind a nearly 2-megabyte file called 25instal.exe that has no further use. A better-designed installation routine would at least inform you that the file could be erased safely.
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