HELPPC is a Quick Reference Utility for the intermediate to advanced
programmer. It is a shareware program written by David Jurgens. The
latest version is 2.10

The topics distributed in an easy database format are:
BIOS interrupts;
DOS interrupts and DOS functions;
EMS and Mouse functions;
BIOS and DOS data structures;
diagnostic codes;
DOS commands;
80x86 assembler instructions;
standard and vendor specific C functions; and
various hardware specifications.