+@node Processor Run Time
+@section Processor Run time
+
+@defun get-internal-run-time
+This function returns the processor run time used by Emacs as a list
+of three integers: @code{(@var{high} @var{low} @var{microsec})}. The
+integers @var{high} and @var{low} combine to give the number of
+seconds, which is
+@ifnottex
+@var{high} * 2**16 + @var{low}.
+@end ifnottex
+@tex
+$high*2^{16}+low$.
+@end tex
+
+The third element, @var{microsec}, gives the microseconds (or 0 for
+systems that return time with the resolution of only one second).
+
+If the system doesn't provide a way to determine the processor run
+time, get-internal-run-time returns the same time as current-time.
+@end defun
+