00469pamaa2200157 4500 0000016442 20100201090000.0 0201567989 005.446 EXT QA76.76.O63 EXT 1992 EXTANDING dos : a programmer's guide to protected-mode DOS edited by Ray Duncan. 2nd ed.. Massachusetts: Addison-Wesley, 1992. vi, 538p; 23cm. Operating systems (Computers) DUNCAN, Ray