The protected-mode 80386 processor is an important step in the evolution of PC software, particularly in the development of better multitasking and data storage capabilities. This book aims to show C programmers how to make the transition to protected mode without having to leave their 8086 code behind. Len Dorfman demonstrates how to port real-mode C subroutines to the 80386 with no modifications, as well as how to write protected-mode C programs and libraries using today's most popular compilers. Other topics include techniques for interfacing with DOS extenders in large C applications and rewriting 8086 assembly code using 80386 instructions. A companion disk of sample programs is offered with the book.