So what, exactly, IS an anti-synch profile?

For linked flow profile (B linked to A), what exactly does the anti-synch configuration do? Does it do a mirror image of the A flow profile about the time axis (i.e., output = 0% axis)? In which case if A were cycling fore and aft, B would be cycling aft and fore? Same profile as the A pump but on when A is off? If the latter, what would happen if A were always on (constant flow)? Something else?

Thanks