CompTIA A+® Certification All-In-One For Dummies®, 2nd Edition

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2.8. Getting an A+

This chapter examines application management from installation to execution. The following points are covered:

16-bit, 32-bit, and DOS-based applications function under Windows 9x and Windows XP, and 64-bit applications if the OS is 64-bit Windows.
There are core architectural differences between 32-bit and 64-bit Windows. Support for applications differs based on the architectural differences of the OSes.
The new application compatibility features in Windows XP allow it to support a wider range of older Windows applications.

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