_SSVRUP — Indicates whether the screen saver is currently running.

Syntax:
%_SSVRUP

The return value is 1 if the screen saver is currently running, 0 if it is not.

rem  Check whether the screen saver is running:
if "%_ssvrup" == "1" echo You can't read this yet (%_time).


See also: the SCRNSAVER command, which can be used to start the screen saver.