Files in this directory are shared between timed and timedc. Timedc has links to this directory. cksum.c files for vax and tahoe are available on monet. protocols/timed.h exists in 4.3BSD. Here, timed.h is just stored in this directory and protocols is a link back to "." so that points to the right file, and there's no need to change each C file to be "timed.h" -- though that could be done.