($
takes the execution token of the following word and
saves it on the compile-stack. The correspondig closing
>) will then feed it into >>COMPILE - so this pair
of word provides you with a prefix-operation syntax
that you may have been seen in lisp-like languages.
($ IF ($ 0= A1 @ )) ($ THEN ." hello " )
Note that an opening simple ( paren is a comment.
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useful immediate primitive