To deactivate the negation mechanism, define Sequence\-Negation in your
profile to an empty value.
-.SS "The Previous Sequence"
-.B Mmh
-provides the ability to remember the `msgs' or `msg' argument
-last given to an
-.B mmh
-command. The entry `Previous\-Sequence'
-should be defined in the
-.B mmh
-profile; its value should be a sequence
-name or multiple sequence names separated by spaces. If this entry
-is defined, when an
-.B mmh
-command finishes, it will define the
-sequence(s) named in the value of this entry to be those messages that
-were specified to the command. Hence, a profile entry of
-.PP
-.RS 5
-Previous\-Sequence: pseq
-.RE
-.PP
-directs any
-.B mmh
-command that accepts a `msg' or `msgs' argument to
-define the sequence `pseq' as those messages when it finishes.
-.PP
-.BR Note :
-there can be a performance penalty in using the
-`Previous\-Sequence' facility. If it is used,
-.B all
-.B mmh
-programs have to write the sequence information to the
-.I \&.mh_sequences
-file for the folder each time they run. If the
-`Previous\-Sequence' profile entry is not included, only
-.B pick
-and
-.B mark
-will write to the
-.B \&.mh_sequences
-file.
-
.SS "The Unseen Sequence"
Finally, the unseen sequence indicates which messages have not been
previously seen by the user.
.BR inc ,
for example,
adds new messages to the unseen sequence.
-Unlike the behavior of the previous sequence, however,
-the unseen sequence will
+The unseen sequence will
.B not
be zeroed by
.BR inc .
.PP
-Similarly, whenever
+Whenever
.BR show ,
.BR next ,
or
.ta \w'ExtraBigProfileName 'u
^Mh-Sequences:~^Name of file to store public sequences
^Sequence\-Negation:~^To designate messages not in a sequence
-^Previous\-Sequence:~^The last message specification given
^Unseen\-Sequence:~^Those messages not yet seen by the user
.fi
.SH "SEE ALSO"
flist(1), mark(1), pick(1), mh-profile(5)
+.SH "HISTORY"
+.SS Previous\-Sequence
+This sequence stored the selected messages for the previous
+.B mmh
+command.
+It was disabled by default because it introduced a lot of extra writes to the
+.IR \&.mh_sequences
+file.
+Additionally, it introduced possible race conditions when running multiple
+.B mmh
+commands in parallel.
+As this feature was rarely used, it was removed.
+
.SH DEFAULTS
None