Registering a Callback

An application registers a callback with a widget to specify a condition in which it is interested and to specify what action should occur when that condition occurs. The callback is registered using XtAddCallback. The action can be any valid dtksh command. For example:

XtAddCallback $WIDGET activateCallback "ActivateProc" 
XtAddCallback $WIDGET activateCallback \    
     "XtSetSensitive $BUTTON false"