This document discusses maintenance and upkeep of computer hardware. It recommends cleaning computers every 3 to 6 months with compressed air, especially keyboards. If liquid is spilled, the computer should be turned off immediately. It also mentions upgrading damaged hardware by adding more memory. A variety of input devices like wireless and optical mice and ergonomic or wireless keyboards are discussed. The functions of the recycle bin, temporary files, cookies, and disk defragmentation are briefly covered.