Instructions
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Introductory text
NOP
SAY [expression]
symbol=value
DROP symbol [symbol,...]
EXIT [expression]
NUMERIC parameter value
DO
LEAVE [symbol]
ITERATE [symbol]
IF expression [;] THEN [;] instruction [ ; ELSE [;] instruction]
SELECT [expression]
PARSE [UPPER] string [template] (also: ARG [template], PULL [template])
QUEUE [expression] ; PUSH [expression]
CALL name [arg][,[arg],...]]
RETURN [value]
PROCEDURE
INTERPRET string
SIGNAL [VALUE] name | SIGNAL ON|OFF condition [NAME label]
TRACE [symbol]
OPTIONS expression
ADDRESS [VALUE] [environment] | ADDRESS environment command
