ACL tutorial or example

I'm trying to implement ACL's in my webapp, and am having trouble
applying what I read in the docs and in my googling to my real-life
application. Could somebody please point me to a good tutorial or some
example code that shows how to set and check the permissions (read only
vs read/write, etc) that a given user will have to access a given
object?


TIA!
Dave
--
Remove the ns_ from if replying by e-mail (but keep posts in the
newsgroups if possible).
.

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