- 
        identifier 
      
- 
        Each resource has an identifier, a unique value associated with
        it that clients use to name the resource. An identifier can be used
        over any connection to name the resource. 
      
- 
        inferiors 
      
- 
        All of the subwindows nested below a window: the children, the
        children's children, and so on. 
      
- 
        initialization 
      
- 
        See contact initialization. 
      
- 
        input event 
      
- 
        See event. 
      
- 
        input focus 
      
- 
        Normally a window defining the scope for processing of keyboard input.
        If a generated keyboard event would normally be reported to this
        window or one of its inferiors, the event is reported normally;
        otherwise, the event is reported with respect to the focus window. The
        input focus also can be set such that all keyboard events are
        discarded and that the focus window is dynamically taken to be the
        root window of whatever screen the pointer is on at each keyboard
        event. 
      
- 
        input-only window 
      
- 
        A window that cannot be used for graphics requests. input-only
        windows are invisible, and can be used to control such things as
        cursors, input event generation, and grabbing. input-only
        windows cannot have input/output windows as inferiors. 
      
- 
        input/output window 
      
- 
        The normal kind of opaque window, used for both input and output.
        Input/output windows can have both input/output and input-only
        windows as inferiors. 
      
- 
        insensitivity 
      
- 
        See sensitivity. 
      
- 
        interactive-stream 
      
- 
        A contact subclass designed to integrate CLUE with the conventional
        stream-based I/O of Common Lisp.