Provided by: tk8.5-doc_8.5.19-3_all 
NAME
tkvars - Variables used or set by Tk ________________________________________________________________________________________________________________
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 tcl_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 decimal integer 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.
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_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.
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.
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.
KEYWORDS
variables, version, text