I have some question about DotNetNuke before making a decision to use it for my customer. They want to split data access layer to another back end system machine behind firewall and they want to use web services  as the communication method. In other word, all methods called to query the database in the DotNetNuke should be changed to call web services instead to get some kind of data.  So can the DotNetNuke do this? and How? Do you have recommendations or suggestions? Thank you. 

Thank for your reply, Cathal. Do you have some suggestions about this or how it can be accomplished? As my understanding, I should change every methods in DataProvider.cs in Core code or (write new one) to call web services? However, most methods in DataProvider return the type of IDataReader. So, I should convert the object of web services to IDataReader? and it will be converted back to object again from CBO. This way is quite slow and waste of computation time. Are there any better way? Another thing, you said that it has a lot of work. Can you point out those works for me? I need to clarify this before sending quotation to my customer.

Thank you!!!