# Introduction

OmniGroupServer is a generic group server that collects user and group security information from many types of repository.

OmniGroupServer can retrieve information from:

- Active Directory
- Documentum
- eRoom
- LDAP
- IBM/Lotus Notes
- Microsoft NT (though Micro Focus recommends retrieving these groups through LDAP).
- Netware
- OpenText LiveLink
- SharePoint (SharePoint uses a combination of SharePoint and NT security, so in addition to retrieving the SharePoint groups you must also retrieve NT groups through LDAP. For more information about setting up mapped security for documents retrieved from SharePoint, refer to the Administration Guide for your SharePoint Connector).
- Text files

OmniGroupServer stores the collected security information and checks for updates at regular intervals.

When a user starts a session with IDOL server, the client application requests security information from IDOL server. IDOL server retrieves the user’s security details from OmniGroupServer and returns the information to the application. The client application then adds the security information to every subsequent query to IDOL. IDOL server can then compare the user’s security details to a document’s access control list (ACL) to determine whether to grant access to the document.

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