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       itkvars - variables used by [incr Tk]


       The  following  global  variables  are  created and managed automatically by the [incr Tk]
       library.  Except where noted below, these variables should normally be  treated  as  read-
       only by application-specific code and by users.

              When  an  interpreter  is  created, [incr Tk] initializes this variable to hold the
              name of a directory containing  the  system  library  of  [incr Tk]  scripts.   The
              initial  value  of itk::library is set from the ITK_LIBRARY environment variable if
              it exists, or from a compiled-in value otherwise.

              When [incr Tk] is added to an interpreter, it executes  the  script  "init.itk"  in
              this  directory.   This script, in turn, looks for other script files with the name
              "".  Mega-widget  libraries  will  be  automatically  initialized  if  they
              install a script named "" in this directory, where "xxx" is the name of the
              mega-widget library.  For example, the [incr Widgets] library installs  the  script
              "init.iwidgets"   in  this  directory.   This  script  establishes  the  "iwidgets"
              namespace, and sets up autoloading for all [incr Widgets] commands.


       itcl, itk, variables