http://support.novell.com/techcenter...d20030204.html

https://www.netiq.com/documentation/...a/agpcvpg.html

https://forums.netiq.com/archive/index.php/t-2820.html

Basically the idea is that an LDAP client connects with a search filter
and uses an LDAP extension/control (I forget which) to tell the directory
to keep waiting for things matching those events, and then return them
immediately when found. The search is persistent, vs. happening one-time
and then returning results (if applicable) and disconnecting once current
results are concerned.

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Good luck.

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