#we set up the viewports we're calling first...
#
%Vl(foo,0,0,100,100,1)
%Vl(bar,0,0,200,200,1)
#
# Now the viewport we're calling them in (if its not drawn in the default (fullscreen) viewport)...
#
%V(0,0,200,200,-)
#
# Now the condition (we'll make up a bullshit tag here) to switch between displaying viewport "foo" or "bar"...
#
%?Xx<%Vd(foo)|%Vd(bar)>
#
# END