ways you can enable Transient Mark mode temporarily, and activate the
mark, for one command only.
-One is to type C-SPC C-SPC; this also sets the mark.
-The other is to type C-u C-x C-x. That does not set the mark.
+One is to type C-SPC C-SPC; this also sets the mark. The other is to
+type C-u C-x C-x, which does not alter the region.
+
+After these commands, Transient Mark mode remains enabled
+until you deactivate the mark--typically with a command that
+alters the buffer, or typing C-g.
** A prefix argument is no longer required to repeat a jump to a
previous mark, i.e. C-u C-SPC C-SPC C-SPC ... will cycle through the