Try this
>cd $HCIROOT/tcl/lib
then type
>ll
This will give you a directory listing of all libraries you have available to tcl. Then go to http://www.tcl.tk/software/tcltk/ and download the software to load on your pc. After you installed the software Read the help File and skip to the section on Libraries. I recommend also reading the Style Guide as it will help with future postings of code.
