Tcl is a highly extensible and introspective language.  The core commands are progressively being replaced by [ensemble]s, and this means that one can add new sub-commands to any of them, wrap any extant subcommand with new functionality (and thereby completely change, or simply augment its functionality.)  Another useful [skinning] technique is [RS]'s [know] command, enabling you to create new commands by matching their names with [regexp]s on-the-fly 

The process of extending existing core commands is hereby and hereinafter called [skinning], and there is [more than one way to skin a language].

Some candidates for [skinning] are:

[info]
[dict]
[oo::class]

<<categories>>Enter Category Here