UADA,
It's what we as elevator professionals refer to as a selective collective operation of the elevator.

An exsample would be, you place a call inside the elevator " car call" to go from the 1st floor to the 15th floor. Some one on the 11th floor hit a down hall call while you are traveling up. The car passes the 11th floor, stops at the 15th floor. The doors open to let you out, the doors close and the car responds to the 11th floor down hall call.

Hope that helps.