-.TH MH-MAIL %manext5% "March 7, 2013" "%nmhversion%"
+.TH MH-FOLDERS %manext5% "February 26, 2014" "%nmhversion%"
.\"
.\" %nmhwarning%
.\"
sequence has at most just a single message number, not a range.
.PP
Sequence names have a maximum size of 998 characters. Each line is also
-limited to a maximum of 998 characters, but RFC\-822 continuation rules
+limited to a maximum of 998 characters, but RFC 822 continuation rules
apply; sequences can be continued across multiple lines by prefixing
continuation lines with a whitespace character.
.PP
that accesses these files must be sure to lock them using the same
locking method as
.BR nmh .
-The locking method is selected when
+The default data locking method is selected when
.B nmh
is configured and can be accessed as a string using
-.BR "mhparam lockmethod" .
+.BR "mhparam datalocking" .
+By default, fcntl locking is used, but this may be overridden with
+the
+.B datalocking
+profile entry.
+.PP
+A second, possibly different, locking method is used by
+.BR inc (1)
+when accessing the user's mail spool file or by
+.B nmh
+programs that open any mbox file. This locking method is selected
+when
+.B nmh
+is configured and can be accessed as a string using
+.BR "mhparam spoollocking" .
By default, kernel-level locking is used if appropriate for the
platform, and it is for popular platforms. That default should also
be the same as used by the