If what you are asking about is mob_progs, which also are called scripts in some codebases, Circle uses something called DG_scripts.
There is a mailing list about it with a FAQ list on this address:
FAQ / Archives:
The people on the mailing list are mostly very friendly and helpful.
DG_scripts also have a website here:
ere:
Hope this helps. The DG_scripts are very versatile and can be used for rooms, mobs and objects.
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