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# Other Message Handlers

`wdhandler` is the main message handler, but other handlers may be used if appropriate. There are essentially three alternatives:

- You can replace `wdhandler` with your own definition. This gives you complete control over the way you respond to events.

- You can define a specific handler function for a given form, using the `wd` command `phandler`. For example, when the following form is run, any event specific to it will invoke the sentence: `abc_event 0` :

      wd 'pc abc;pshow;ptop'
      wd 'phandler "abc_event 0"'
      abc_event=: wdinfo bind 'abc form handler'

- You can bypass the handler mechanism entirely by issuing the `wd` command `wait`, described below.

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