I am using the client side API WL.Client.InvokeProcedure(invocationData, options, UseSendInvoke) in worklight 6. But I could not find a description for the para
There's no UseSendInvoke argument that WL.Client.invokeProcedure takes, at least not in the public API defined in the documentation. You can look at the documentation for Worklight v6.0.0, Worklight v5.0.6, Worklight v5.0.5 to learn more about that particular API.