[incr Tcl] provides object-oriented extensions to Tcl. For further reference visit: https://www.tcl.tk/man/tcl8.6/ItclCmd/itcl.htm
The packages required are available as part of MagicSplat’s binary distributions of Tcl/Tk for Windows. Visit magicsplat.com for more information.
name: itcl — object-oriented extensions to Tcl
package require Itcl
Returns version 4.2.0
TclOO – Object-Oriented Tcl
package require TclOO
Returns version 1.1.0