A portable *(concurrent) *(actor) extension of the *(object-oriented) *(programming language) _(CLOS), itself an extension of _(Common Lisp). It describes _(active) objects, remote messaging and references, and synchronization mechanisms. Remote messages can be asynchronous (<em>past</em>), synchronous (RPC, or <em>present</em>), or promise (<em>future</em>-creating), which has a past message implicitly called on it for a result, and a forcing present message.

<ul class="implementations">
<li>See _(its home page| http://lki-www.informatik.uni-hamburg.de/~hotz/), by the author, Lothar Hotz.
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