Help for Microsoft QuickHelp (qh.hlp) (Topic list)
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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
q.mh25
Unable to open database  The most likely cause for being unable to open
a database is that you have opened too many databases, or the database
you have requested does not exist. To permanently reduce the number of
open databases, combine them by using the copy command with the +
option.