[incr Tcl] is a set of extensions to the Tcl
language for object-oriented programming. [incr
Tcl] (itcl) provides the extra language support
needed to build large Tcl/Tk applications. It
introduces the notion of objects, which act as
building blocks for an application. Each object is
a bag of data with a set of procedures or
"methods" that are used to manipulate it. Objects
are organized into "classes" with identical
characteristics, and classes can inherit
functionality from one another.
