How to link to an existing LDAP server in Windows for authentication

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http://serverfault.com – So here's the deal. I have a Windows 2008 R2 Server that I want to have use an existing LDAP server for authentication and groups, etc. In other words, I dont want to administer the accounts on the Windows 2008 server itself, but I want the server to think that they are there (like acting as a relay or repeater). What I'm trying to do is have a way of having people access their Web published RemoteApp applications, but again, I dont want to manage the users on that server, there's already an existing LDAP server with all of that info. Any ideas? Is this possible? Thanks in advance. (HowTos)