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7.2.8 Keep; GetIntVec; SetIntVec

The routines Keep, GetIntVec and SetIntVec in the Dos unit do not even make sense on DJGPP (32 bit Dos extender). If your program uses these, it is either a low-level Dos utility for which porting to a 32 bit environment might cause bigger problems (because the internal issues of DPMI become relevant which are usually hidden by DJGPP), or it installs interrupt handlers which will have to be thought about more carefully because of things like locking memory, knowing about and handling the differences between real and protected mode interrupts, etc. For these kinds of things, we refer you to the DJGPP FAQ (see DJGPP FAQ (the DJGPP FAQ)).