semaphore

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To communicate commands to the formations on the field and demonstrate the Signal Corps' historic and important role in the Army and nation's history, semaphore flags were used during the change-of-command ceremony.
Semaphore flags, wrapped around the huge Mill Dam Chimney and along the lampposts and columns along the grassed area on the banks of the river, will spell out a particular saying and visitors will have a chance to show off their deciphering skills by working out exactly what the message says.
There have been special activities for children throughout half-term, and they have been able to test their skill in identifying enemy planes, send coded messages with semaphore flags, and practice civil defence workers' drills.
These mechanisms, which include "busy" logic, semaphore flags and interrupts, enable customers to manage contention issues between ports easily without external circuitry.