API : How can I author a user event?

• http://around-the-corner.typepad.com/adn/2012/07/setting-a-user-event-within-maya.html

# Here's how you would register a new user event type called 'myEvent':
import maya.OpenMaya as om
om.MUserEventMessage.registerUserEvent('myEvent')

# To have a function called 'myFunc' execute whenever the event occurs:
def myFunc(data):
    print('Got a myEvent event!')
callbackId = om.MUserEventMessage.addUserEventCallback('myEvent', myFunc)

#To send a 'myEvent' event:
om.MUserEventMessage.postUserEvent('myEvent')

#To remove the callback function when done:
om.MUserEventMessage.removeCallback(callbackId)

• API: How can I author callbacks for Maya events?