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--- at:tutorial:appendix [2008/07/10 16:17] – added tvcutsem
+++ at:tutorial:appendix [2008/07/10 16:23] – * tvcutsem
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 ==== Ambient References ====
+Ambient references are defined in the module ''/.at.lang.ambientrefs'' . An ambient reference is a special kind of far reference which refers to an ever-changing collection of objects of a certain type. For example:
+<code>
+import /.at.lang.ambientrefs;
+deftype Printer;
+def printers := ambient: Printer;
+</code>
+In the above code, ''printers'' refers to all nearby objects exported by means of  the ''Printer'' type tag. An more in-depth explanation of ambient references can be found on the [[:research:ambientrefs|research page of ambient references]].
+Ambient references ship with two so-called "implementation modules": the module ''/.at.ambient.ar_extensional_impl'' and the module ''/.at.m2mi.ar_intensional_impl''. By default, the extensional implementation is used, but this can be changed by passing the desired implementation module as a parameter to the ''/.at.lang.ambientrefs'' module.
 ==== Structural Types ====
 ==== Traits ====