This term is frequently used, but I've not seen it defined here on the wiki. When I ([lv]) talk about a ''core'' [tcl] command, I mean a command that is available after one builds one of the source distribution variations of tcl maintained by the [TCT]. A core command of [incr tcl] would be one of the commands from the source distribution variations of that software as maintained by its project maintainers. So if someone comes along and patches tcl for a new command, that new command - the new ''dict'' dictionary command for example - would be a core command because it is in the tcl 8.5 alpha source distribution. ---- [category glossary]