This is the online version of the programmer's manual, complete with references to all ChemApp subroutines with dozens of code examples in both FORTRAN and C, plus several worked examples which help you get an idea of how to start coding your own application programs using ChemApp. Note that the programmer's manual for the free light version of ChemApp is almost identical to the regular version.

You may browse the manual online.

 The programmers manual can also be downloaded in different archives at the ChemApp downloads page.