When loading r-code from a memory-mapped library, OpenEdge opens the library and maps it in shared memory where multiple users can access it. The library remains mapped until the end of your OpenEdge session or until you remove the library from the PROPATH. When OpenEdge needs to execute an r-code segment for a member in that library, it accesses the library in shared memory. This is even faster than loading r-code from a standard procedure library.