creating user defined special parameters?

[Atom Smasher <atom@xxxxxxxxxxx>]

is there a way, from within the shell, to create a special parameter?

in other words; is there a way to create a variable that refers to a 
function, and execute the function when the variable is used?

eg...
	date_func () { date }
	typeset  [options]  date  date_func

so that:
	echo $date

would return the _current_ date & time?


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