That is the default is for the manuals to always be present. Paging program for -m option. An external utility for display of output, for example list. Echoes user's pass phrase. Always leave off, unless you wish the world and his dog to see your pass phrase.
Plaintext files are text files.
Turn on with -t option on the command line. Overridden by the environment variable TMP . Alternative to TZ environment variable. Use TZ for time zone settings. The only time this is likely to be required, is if PGP is being run from floppy on a common system and access to the system files is not permitted.