HP RPN SCIENTIFIC WP 34S Owner's Manual page 144

The library files are also included in the distribution ZIP file in source form (*.wp34s) as
well as in a precompiled library (wp34s-lib.dat – some 3
kB ) which is part of the
firmware files calc_full.bin, calc_xtal_full.bin, and calc_ir_full.bin – so
you get the full library when you load one of these firmware files into your WP 34S (see
Appendix A about how to do this).
When you copy wp34s-lib.dat into the directory your WP 34S emulator runs in, you
can access all those routines via CAT from your emulator as well. See Appendix D.
See Appendix H if you want to write such routines yourself.
WP 34S Owner's Manual
Edition 3.1 Page 144 of 211