reactor in entity

[clovis]

Hello
In a dwg I've "entget" an entity. In the return list I get the following list :
(102 . "{ACAD_REACTORS") (330 . <Entity name: 7803b6a0>) (102 . "}")
I probably should take a good look in the help file but could someone tells how it works? and how could I use this (above) one?
Thanks

[matt.worland]

An object reactor allows Lisp to watch an object for modifications. For a better explanation and example, look in AutoCAD's Developers Help file for vlr-object-reactor

[clovis]

Thanks I'll take a look