+.SH ENVIRONMENT VARIABLES
+.SS "Output Control"
+.TP
+.BR MDP_LIST_HEAD[1-3],\ MDP_LIST_OPEN[1-3]
+Controls the list characters of unordered lists.
+
+The default is equivalent to:
+.br
+MDP_LIST_OPEN1=' | '
+.br
+MDP_LIST_OPEN2=' | '
+.br
+MDP_LIST_OPEN3=' | '
+.br
+MDP_LIST_HEAD1=' +- '
+.br
+MDP_LIST_HEAD2=' +- '
+.br
+MDP_LIST_HEAD3=' +- '
+.