DOS/32 Advanced DOS Extender - D32A C/C++ Run-Time Library Reference 6.0 - DOS/32 Advanced D32A Library - System functions The system functions available in D32A C/C++ Run-Time Library can be used to issue protected mode interrupts as well as to simulate real mode interrupts with a single function and to allocate and deallocate protected mode selectors. Copyright © Supernar Systems, Ltd. 1996-2002 All Rights Reserved.