For instance, a report may contain blank text boxes when the user expects
to see names and other data. This situation could even occur a long time after the data entry error
has occurred, and the error may occur many times before its discovery.
On rare occasions, runtime errors are traceable to a hardware failure such as a full disk or network
problems, leading to the frequent ???*&#^ computer??™s fault!??? complaint. Modern desktop computers
are much more reliable than they were a few years ago, making this a rare occurrence. Most application
errors are caused by the people who program computers. Many hardware failures, such as a
hard-drive crash, are easily recognized by the user.
Other runtime errors may be less obvious and more difficult to deal with. For instance, a network
glitch may cause data loss or make lookup data temporarily unavailable. Running out of swap disk
space makes Windows run erratically or crash. Many computers are equipped with marginal memory,
making it difficult or impossible to run large queries or use the built-in Access wizards.
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