NAME

       itkvars - variables used by [incr Tk]

DESCRIPTION

       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.

       itk::library
              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 "init.xxx".  Mega-widget
              libraries will be automatically initialized if they install a  script  named  "init.xxx"  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.

KEYWORDS

       itcl, itk, variables