The second form of template is the "named-procedure" form.
If the template is a word rather than a list, it is taken as the name of a procedure.
That procedure must accept a number of inputs equal to the number of parallel data slots provided by the tool; the procedure is applied to all the available data in order.
That is, if data
?3 are available, the template
"PROC is equivalent to
[PROC ?1 ?2 ?3].
SHOW (MAP "word [a b c] [d e f])[ad be cf]
TO DOTPRODUCT :a :b ; vector dot product OUTPUT APPLY "sum (MAP "product :a :b) END