The process of connecting to Microsoft Dynamics CRM 2011 is a two step process:
* We first connect to the Discovery Service, and find what Organisations are 
available
* Later, we connect to the chosen Organization Service to run our selected 
queries & updates

The WSDL is separate for each service, therefore it seems theoretically 
possible that they use separate Authentication methods, and therefore different 
login details could be required.
At present, only Federation security is supported, and 
DynamicsCRM2011_Connector class checks the security method for both services to 
ensure that Federation Security is used - but only one set of login details can 
be supplied to the Connector.

Ideally, research is needed to determine if it's really possible to have 
separate Authentication Methods (if not, we could skip parsing the Organization 
Service WSDL), and if it's really possible to have separate login details for 
each Service.

If it is possible, then all references to 
DynamicsCRM2011_Connector::security['username'] and ['password'] would need to 
be separated for each Service, and new functions would be needed to supply 
these details to the Connector.