In SharePoint 2013, CSOM will allow developers to interact with Workflows .Developers can start ,stop the workflow, in CSOM .In this blog, I'm focusing on the key libraries to be referenced in Client Object Model.
DLL Libraries
Microsoft.SharePoint.Client.dll
Microsoft.SharePoint.Client.Runtime.dll
Microsoft.SharePoint.Client.WorkflowServices.dll
JavaScript Libraries
SP.js
SP.Runtime.js
SP.WorkflowServices.js