APL*PLUS II runs under the MS-DOS operating system (releases prior to 5.0) and links with pre-compiled modules written in C, FORTRAN, or Pascal. Wheeler gives a thorough description of the problems, issues, and tentative solutions to working on an interface between these two widely contrasting environments along with a description of future needs and plans. The solutions proposed are reasonable, usable, and thoroughly explained.

The paper should be of interest for anyone who is working on APL interfaces to other environments, problems integrating precompiled language routines, or issues in working with current MS-DOS versions. Some background in APL is helpful, but could be picked up quickly by a reader interested in the related non-APL problems described. The paper contains much excellent pedagogy and enough open-ended presentation material to make it useful for college-level courses in compilers, operating systems, or both. The biggest difficulty may be finding the proceedings in which it appears, which is somewhat obscure except to followers of APL.