Labels:text | font | handwriting | screenshot | menu | blackboard OCR: Note A contact will receive only the types of events described by its event specifications, i.e. by event specifications in its in- stance and class event translations. CLUE automatically sets the event mask of the contact window, based on the contact's event specifications. Event masks are a detail of CLUE inter- nals, but you can find more information about them in the X Protocol Specification and the CLUE specification.