This account contains PIN, the Procedure Interpreter designed by James G Downward as a much smaller version of AT. I have rewritten most of it to use file primitives (instead of FCS) and to do its own parsing (instead of using CSI) - this has made it vastly smaller. I have also added a 'Chain' facility. From: Phil Stephensen-Payne, c/o Systime Ltd., Concourse Computer Centre, 432 Dewsbury Road, LEEDS LS11 7DF, England.