Yes. ActiveADAPTER is available as a Windows Communication Foundation (WCF) service. So with or without BizTalk Server, you can query and update Active Directory with ActiveADAPTER
![wcf_addref](http://www.activeadapter.com/wp/wp-content/uploads/2012/10/wcf_addref.png)
ActiveADAPTER WCF exposes essentially the same functionality as our Active Directory Send and Receive Adapters.
ActiveADAPTER WCF services can be consumed by BizTalk Server, but BizTalk Server is not required.
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Yes. The ON CHANGE ONLY option on the Active Directory Receive Adapter provides this feature. A message is submitted to your BizTalk application only when the results of the query you have specified change. This feature provides a great way to trigger orchestrations and keep information in your Enterprise Applications synchronized.
There is also a REAL-TIME mode that gets events from Active Directory asynchronously and submits them to BizTalk as they happen.
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