Workflow Manager 1.0-SharePoint 2013

Hi

   I need to know,

           1. Under What scenarios Workflow Manager 1.0 is used?

           2. What are the Pros & Cons in Workflow Manager 1.0

           3. How it will be used in SharePoint Server 2013?

           4. Can custom code to be implemented using Workflow Manager 1.0?

           5. Using this, will it be possible to bind the entire  workflow to a single list or entire workflow to be bind to multiple lists?

           6. What are the limitations using Workflow Manager 1.0 with SharePoint 2013?

Regards

Siva