Hello, World Program Several variants written in APL. http://www2.latech.edu/~acm/helloworld/apl.html

TechEncyclopedia Many computing related definitions here http://www.techweb.com/encyclopedia/defineterm?term=APL&Define=Define

Brighton University (UK) The APL section of "The Brighton University Resource Kit for Students". The higher levels of this site are well worth studying as well. http://burks.bton.ac.uk/burks/language/apl/index.htm

Why APL? Anonymous essay from 1983 published by ACM SIGAPL, which explains the strengths of the APL approach to algorithm design. http://www.acm.org/sigapl/whyapl.htm

Gnat for MacOS X Installation-HOWTO A simple step-by-step guide to installing gnat on Apple MacOS X. http://adrianhoe.com/adrianhoe/GnatMacOSX-Installation-HOWTO.shtml