NAME

       geometry, tk_library, tk_patchLevel, tk_strictMotif, tk_version - Variables used or set by Tk
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DESCRIPTION

       The following Tcl variables are either set or used by Tk at various times in its execution:

       tk_library     This  variable  holds  the  file  name for a directory containing a library of Tcl scripts
                      related to Tk.  These scripts include an initialization file that  is  normally  processed
                      whenever a Tk application starts up, plus other files containing procedures that implement
                      default behaviors for widgets.

                      The initial value of tk_library is set when Tk is added to an interpreter;  this  is  done
                      by searching several different directories until one is found that contains an appropriate
                      Tk startup script.  If the TK_LIBRARY environment variable exists, then the  directory  it
                      names  is  checked  first.   If  TK_LIBRARY is not set or does not refer to an appropriate
                      directory, then Tk checks  several  other  directories  based  on  a  compiled-in  default
                      location, the location of the Tcl library directory, the location of the binary containing
                      the application, and the current working directory.

                      The variable can be modified by an application to switch to a different library.

       tk_patchLevel  Contains a dot-separated sequence of decimal integers giving the current patch  level  for
                      Tk.   The  patch  level  is  incremented  for  each  new release or patch, and it uniquely
                      identifies an official version of Tk.

                      This value is normally the same as the result of “package require Tk”.

       tk_strictMotif This variable is set to zero by default.  If an  application  sets  it  to  one,  then  Tk
                      attempts  to adhere as closely as possible to Motif look-and-feel standards.  For example,
                      active elements such as buttons and scrollbar sliders  will  not  change  color  when  the
                      pointer passes over them.  Modern applications should not normally set this variable.

       tk_version     Tk  sets  this  variable  in the interpreter for each application.  The variable holds the
                      current version number of the Tk library in the form major.minor.   Major  and  minor  are
                      integers.  The major version number increases in any Tk release that includes changes that
                      are not backward compatible (i.e. whenever existing Tk applications and scripts  may  have
                      to change to work with the new release).  The minor version number increases with each new
                      release of Tk, except that it resets to zero whenever the major version number changes.

   INTERNAL AND DEBUGGING VARIABLES
       These variables should not normally be set by user code.

       tk::Priv
              This variable is an array containing several pieces of information that are private  to  Tk.   The
              elements  of  tk::Priv are used by Tk library procedures and default bindings.  They should not be
              accessed by any code outside Tk.

       tk_textRedraw

       tk_textRelayout
              These variables are set by text widgets when they have debugging turned on.  The values written to
              these  variables  can be used to test or debug text widget operations.  These variables are mostly
              used by Tk's test suite.

OTHER GLOBAL VARIABLES

       The following variables are only guaranteed to exist in wish executables; the Tk library does not  define
       them itself but many Tk environments do.

       geometry
             If set, contains the user-supplied geometry specification to use for the main Tk window.

SEE ALSO

       package(3tcl), tclvars(3tcl), wish(1)

KEYWORDS

       environment, text, variables, version