$Header: $ $Log: $ Nigel sez: I created this directory to hold procedures that are created to wrap up the most central system data entities such as the U area and process structure. In order to provide a semblance of decoupling, these routines form mid-level functional interfaces to the core system data structures. Each routine isolates some data item or system, and typically provides "library-level" functionality that is expected to find wide use. Where possible, these routines depend only on one another and on the true system primitives such as memory allocation and multiprocessor locks. These files have been created in an ad-hoc way, and this system is still in an embryonic form. Except for those routines that are provided as part of the DDI/DKI implementation, the specifications are still somewhat fluid and the documentation non-existent, so unless something has been stable for a while, be prepared for some tuning of the parameters to a routine as the interfaces evolve.