The $ operator is very useful. It equates the contents of the top
of the stack (or variable designator). So, for example, a string could be
pushed as an argument to a function, and within that function this operator
could be used to equate the argument. For example, here is a definition of
strlen for any database field.
%%EQUATE STRLEN $>>Y 0>>X [<<Y<<X'0=~~;++X>>X]<<X
The function might be called with %%NAME#STRLEN. Note that the %%
operator is used to put the field name on the stack. Then within the function
the $ operator is used to evaluate the stack argument as an equate
expression, thus getting the contents of the field.
The \ is the null operator. It does nothing, but is useful for
separating operands or for escaping a newline character.
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