A '''routine''' is a modular unit of a [program]. In Tcl, there is a routine
associated with each available [procedure]. To [eval%|%evaluate] a command,
Tcl uses the first [word] of the command to find the procedure and execute the
associated routine. Many [Tcl Commands%|%built-in commands] are implemented as
[C] functions. In the case of a procedure defined by `[proc]`, the primary
function of the routine is to evaluate the body of the procedure.
** See Also **
[lambda]: About implementing at [script] level a routine that isn't a [procedure].
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