Well, the classic one is power. With the supplied remote, one press on the power button turns the power on, and the next press turns it off. This is tough when you're programming a macro to turn the power on for all the units in the system, since if the power is already on, you turn it off. That's kinda the definition of a toggle. So, the typical way round this, when you have to, is to find some other command that turns on a unit that is off, like (in a DVD player) "Play" but is also recognized when the unit is off (because so many of our electronic units are vampires -- on standby even when off). So, a macro that turns a 921 on, for example, should be , leaving the unit on.