lok files are for locking some action which should be run or
made only by one user or holding process. You can find config.lok invoked for
serial update of config.xml, then each server has its own lok file for server
and lok file for embedLDAP to avoid start same manged server in time twice.
Then you can find edit.lok invoked by Edit actions for one user editing domain
configuration in time. I am not sure if other exist.
It is good to know it, because sometimes when server crash
you cant start servers and it writes something like "Instance is already
running" Or second issue server begin to start and then after line in log
with text "....IIOP..." next step is load embedLDAP but server stuck
for long time in this step because ldap is locked or corrupted. Remove of these
lok files usually can help you to start server perfectly again
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