Build Event Handlers are tasks which execute on the server (as opposed to Actions which run on the agents). They can be configured to respond to one or more Build Events which occur as the build progresses.
The following Event Handler types are available:
Build Event Handlers can be created within the Events step of the Configuration Wizard.
Friendly name for the event handler (this will be visible in the 'Events' section of the website)
The order in which the event handler will be run (relevant in the situation where multiple event handlers are present).
Whether this event handler will be run or not. Disabling event handlers can be useful when setting up a build process.
The type of event handler to be used.
The conditions which must all evaluate as true before the build event handler is executed.