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The Tcl::Tk submodule of the Tcl module gives access to
the Tk library. It does this by creating a Tcl
interpreter object (using the Tcl extension) and binding
in all of Tk into the interpreter (in the same way that
wish or other Tcl/Tk applications do).
Access to the Tcl and Tcl::Tk extensions
To get access to the Tcl and Tcl::Tk extensions, put the
commands
require Tcl;
use Tcl::Tk;
near the top of your program. The Tcl extension does not
alter your namespace at all (hence the "require"). The
Tcl::Tk extension imports the widget and other Tk commands
into your namespace (hence the "use").
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