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       The Tcl extension module gives access to the Tcl library
       with functionality and interface similar to the C
       functions of Tcl.  In other words, you can

       create Tcl interpreters
               The Tcl interpreters so created are Perl objects
               whose destructors delete the interpreters cleanly
               when appropriate.

       execute Tcl code in an interpreter
               The code can come from strings, files or Perl
               filehandles.

       bind in new Tcl procedures
               The new procedures can be either C code (with
               addresses presumably obtained using dl_open and
               dl_find_symbol) or Perl subroutines (by name,
               reference or as anonymous subs). The (optional)
               deleteProc callback in the latter case is another
               perl subroutine which is called when the command
               is explicitly deleted by name or else when the
               destructor for the interpreter object is
               explicitly or implicitly called.

       Manipulate the result field of a Tcl interpreter

       Set and get values of variables in a Tcl interpreter

       Tie perl variables to variables in a Tcl interpreter
               The variables can be either scalars or hashes.
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