P6 is just like P5 in regards to the runtime. You can link it between the two apps and not bother with rebuilding it. It also works across drives (P6 is on G:, P5 and the external runtime is on H: ) And as an FYI for those who use P booost, P6 doesn't seem to have any issues with it whatsoever. So no rebuild to access all that stuff you have in custom runtime folders needed. So far.