1. One who handles something (especially manually) or someone.
    ''The handler of a weapon gets a symbolic sensation of deadly power.
  2. A controller, trainer, someone who handles a specified thing, animal or person (especially a prizefighter).
    ''The spy's handler told him to approach the subject by posing as a dog handler.
  3. A subroutine that handles a particular situation such as an event or exception.

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