In Logic Maestro, the Latch component can be very useful.

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It can be used to create advanced logic setups, but the two most used applications of latches are:

1. Using /Q as an Always-On trigger for some logic that needs to start active.

2. Having a latch-disabled control put as a key on multiple panels. That control drives the Toggle input of a latch, so the output (a route, an LED, a relay) can be turned on at any position with the control and off at any position that has that control on a key.

The diagram and odd symbols (a latch walks into a Q bar) comes from Electrical Engineering and the use of physical components to create flip-flops which can change their output state.

TOGGLE - sets the latch output (Q) to ON if the latch is OFF, and vice-versa.

SET - turns the latch state ON and leaves it ON. If the SET input is always ON, the latch will never be OFF.

RESET - turns the latch state OFF and leaves it OFF If the RESET input is always ON, the latch will never be ON.

OUTPUT (Q) - the state of the latch, gives an ON or OFF signal to connected elements.

INVERTED OUTPUT (/Q) - the opposite state of the latch, gives an OFF if the latch is ON and an ON if the latch is OFF. Can be thought of as the OUTPUT with a NOT gate.