leppie scripsit:

> All the examples I have (ever?) seen, simply use an identifier.

In practice, people simply bind top-level variables to parameter objects
and use them to emulate Common Lisp dynamic variables.  But parameters
have a great deal more flexibility, being in fact first-class (like most
things in the Lambda Order): they can be passed or returned by procedures,
stored in data structures, bound to local variables, etc.

--
Do what you will,                       John Cowan
   this Life's a Fiction                cowan@ccil.org
And is made up of                       http://www.ccil.org/~cowan
   Contradiction.  --William Blake

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