Your question is very short and not telling what you are actually looking for.
So here are some information I would like to share with you related to LDAP.
When we talk about LDAP, there are two things
1. You want to pull user data from LDAP/AD to Remedy people form, which required to configure ARDBC plugin and once configured, then create Vendor form and to access LDAP data. You will be required to create bunch of remedy workflows to populate this data in CTM:People form
2. You want people to get authenticated by AD, whenever they try to access Remedy, this required to configure AREA.
Let me know if you looking for more information on this.
there is a plethora of information on configuring and using LDAP - please use the search function and also check out the documents section.
I also suggest you read the tips and tricks section at the bottom of this page before posting: