+.PP
+If the terminfo entry contains a \fBXM\fR string,
+this is used in the xterm mouse driver to control the
+way the terminal is initialized for mouse operation.
+The default, if \fBXM\fR is not found,
+corresponds to private mode 1000 of xterm:
+.RS
+\\E[?1000%?%p1%{1}%=%th%el%;
+.RE