Richard Suchenwirth - Tcl is the Tool Command Language. Execution is done by splitting scripts into commands (by newline or semicolon). A command is a sequence of words, the first being the command name, the rest its arguments. (So far from Tcl syntax).
All available command names at a given time (and namespace) are returned by
info commands
They may have come from several sources:
To introspect commands in other than the current namespace, walk the tree with namespace children.