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SAIL's main feature is a symbolic data system based upon an associative store (based on the [[LEAP programming language|LEAP system]] of Jerry Feldman and Paul Rovner). Items may be stored as unordered sets or as associations (triples). Other features include processes, events and interrupts, contexts, backtracking and record garbage collection. It also has block-structured macros, a coroutining facility and some new data types intended for building search trees and association lists.
A number of interesting software systems were coded in SAIL, including some early versions of [[File Transfer Protocol|FTP]] and [[TeX]], a document formatting system called PUB, and the first general purpose, interactive spreadsheet program called BRIGHT.
In 1978, there were half a dozen different operating systems for the PDP-10: [[Incompatible Timesharing System|ITS]] (MIT), [[WAITS]] (Stanford), [[TOPS-10]] (DEC), [[CMU TOPS-10]] (Carnegie Mellon), TENEX ([[Bolt, Beranek and Newman|BBN]]), and [[TOPS-20]] (DEC, based on TENEX).
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