frssup.lib is built to prevent duplication of code. The functions in frssup.lib are prefixed by FrsSup and are used by ntfrsapi and other frs tools. Currently the service has a copy of these functions. They should be shared in the future. They are not shared right now due to the following issues. 1] Some of the functions in the service have DPRINT which do not make sense for ntfrsapi and other tools. 2] Service has special memory allocator functions that are traced. These functions can not be called from other tools. 3] Some of the functions check values of FRS registry parameters (e.g. debug flags).