I had posted a while back a NAS solution to use two NAS instances to run jobs for unlimited companies. This solution worked great and saved money on buying NAS licenses for each company. In NAV 2013 NAS now runs on service tier. The old solution will not work. I had also written a second solution that used NAS and web service. It used MS xmldom COM automation object that could be used in NAV 2013 R2 but need to change the data type to dotNET data type.