The sam tutorial speaks of sam being "downloaded". (A tutorial for the sam language.) I am not exactly sure what "downloaded" means in this context.

sam originally ran on a terminal that had its own little operating system and applications could be downloaded into each terminal window.

sam ran in two parts: sam on the host and samterm (downloaded) on the terminal. they communicate using a unique protocol.

Here's a video about the original Blit terminal and how that works: https://www.youtube.com/watch?v=emh22gT5e9k

(The original editor on the Blit was jim.)

sam is described in detail in a paper: https://docs.google.com/viewer?url=https%3A%2F%2F9p.io%2Fsys%2Fdoc%2Fsam%2Fsam.pdf