What do we mean by trigger A, trigger B, and trigger C?

In the HCS08 target, A and B are two address comparators referred as triggers that make one big trigger. The trace collection starts or ends depending on the From or Until trigger selected along with a combination of actions involving A and B.

In the ColdFire V1 target, the triggers, A, B, and C are used to start and stop the trace collection. The triggers, A and B are set on a function address and trigger C is set on a variable address.