i

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.