.HP 5
.na
.B mhl
-.RB [ \-folder
-.IR +folder ]
.RB [ \-form
.IR formfile ]
.RB [ \-width
switch does only take file names, but no format strings with a prepended
equal sign `='.
.PP
-Finally, the
-.B \-folder
-.I +folder
-switch sets the
-.B nmh
-folder name,
-which is used for the \*(lqmessagename:\*(rq field described below. The
-environment variable
-.B $mhfolder
-is consulted for the default value,
-which
-.BR show ,
-.BR next ,
-and
-.B prev
-initialize appropriately.
-.PP
.B Mhl
operates in two phases: 1) read and parse the format file, and
2) process each message (file). During phase 1, an internal description
specifies a list of components which are never output.
.PP
The component \*(lqMessageName\*(rq (case\-insensitive) will output the
-actual message name (file name) preceded by the folder name if one is
-specified or found in the environment. The format is identical to that
-produced by the
-.B \-header
-option to
+message file name as a one-line header, similar to
.BR show .
+E.g. ``(Message 42)''
.PP
The component \*(lqExtras\*(rq will output all of the components of the
message which were not matched by explicit components, or included in