===Extend the schema===
==The Geek way==
You can create attributes, new schema (class) but you can't edit an existing schema.

Read [[http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ad/ad/defining_a_new_attribute.asp|this doc]]
I think the best way to know how to create the .ldif is take a look in existing schema, but, here an example :

<code>
dn: CN=asyd,CN=Schema,CN=Configuration,DC=test,DC=com
attributeID: 1.2.841.1.1.1
attributeSyntax: 2.5.5.9
cn: asyd         
isSingleValued: TRUE
lDAPDisplayName: asyd
adminDisplayName: asyd
searchFlags: 0
objectClass: top
objectClass: attributeSchema
name: asyd
instanceType: 2
oMSyntax: 2
OMObjectClass: +s
isMemberOfPartialAttributeSet: TRUE
</code>

==The Click way==

  - Open a console
  - Execute regsvr32 schmmgmt.dll
  - Open mmc
  - Add the new snapin: //Active Directory Schema//

==Query AD via standard LDAP tools==

Note the administrator name depend of your locale.

  * bind with a user or Administrator (cn=Administrator,cn=users,[suffix])