An area of the screen on which the user can drop a drag icon. A means by which the server notifies clients of changes of state. An event may be a side effect of a client request, or it may have a completely asynchronous cause, such as the user's pressing a key or moving the pointer. In addition, a client may send an event, via the server, to another client. A procedure called by the Xt event dispatcher when a widget receives an event of a given type.
Event handlers provide input processing at a lower level than callbacks or action routines.
A program loop in which the application receives an event, handles the event, and then waits for the next event. An event loop usually does not end until the user terminates the application. Xt provides an event-dispatching loop suitable for most applications. See keyboard focus. A list of entries, each of which consists of a font list element tag and either a font or a font set.