.RE
.PP
.BR Sequence\-Negation :
-not
+\&!
.RS 5
Defines the string which, when prefixed to a sequence name, negates
-that sequence. Hence, \*(lqnotseen\*(rq means all those messages that
-are not a member of the sequence \*(lqseen\*(rq. Read the
+that sequence. Hence, \*(lq!foo\*(rq means all those messages that
+are not a member of the sequence \*(lqfoo\*(rq.
+To deactivate this mechanism, define Sequence\-Negation to an empty value.
+Read the
.BR mh\-sequence (7)
-man page for the details. (profile, no default)
+man page for the details. (profile, default: !)
.RE
.PP
.BR Unseen\-Sequence :
-unseen
+u
.RS 5
-Names the sequence or sequences which should be defined as those
-messages which are unread. The commands
+Names the sequence or sequences which shall contain any unread messages.
+The commands
.BR inc ,
.BR rcvstore ,
.BR mhshow ,
and
.B show
will add or remove messages from these
-sequences when they are incorporated or read. If not present or
-empty, no such sequences are defined. Otherwise, each message is
+sequences when they are incorporated or read. If defined with an empty
+value, no such sequences are defined. Otherwise, each message is
added to, or removed from, each sequence name given. Read the
.BR mh\-sequence (7)
man page for the details about this sequence.
-(profile, no default)
+(profile, default: u)
.RE
.PP
.BR Mh\-Sequences :
(profile, default: `@')
.RE
.PP
+.BR Attachment-Header :
+Attach
+.RS 5
+The (pseudo) header in draft messages, that contains files to be attached
+to the message on sending.
+If you like to type a lot, name it `X-MH-Attachment'.
+(profile, default: `Attach')
+.RE
+.PP
.BR automimeproc :
.RS 5
If defined and set to 1, then the