how to plot nothing with gnuplot

Hi. Sorry if this is FAQ or in the archives, I did not manage to find
it.

I am in the situation where I want gnuplot to draw only "set" objects
(rectangles  and arrows) and the axis and grid. But it won't before I
use the plot command, right? Now, just fini****ng my command file with
'plot' (and no parameters to plot) is an error. So, how do I ask
gnuplot to plot the graph area with ONLY the axis and all the "set"
objects.

Thanks
PS: using gnuplot 4.3 patchlevel 0