From an early 'hosts' file: HOST MIT-RTS, [CHAOS 470,LCS 10/11],SERVER,UNIX,PDP11,[RTS,DSSR] I'd rather depend on that, than on my memory! (The names at the end are aliases.) While I was looking for a really early host file (I recall our early TFTP command had one; I don't think it was built into the command, but it might have been),~p I found a /jnk directory in MIT-CSR's root; it had a lot of interesting stuff in it. One particularly interesting one was 'kov': The idea of this kernel overlay scheme is to increase the amount of code that can be included in the UNIX kernel. This is done by reserving one of the I space segmentation registers (the highest free, usually KISA5 for non-split systems) and changing its value dynamically so as to map in the appropriate code as needed. I chose to use only one page register (limiting each KOV to 4Kw), in order to minimize the mapping overhead. I wonder if this is an early predecessor to the overlay stuff in BSD 2.9 (and later BSD's)? That stuff is all poorly documented, and I'm not up for poring through both to compare them. This one was all done by Ken Harrenstien (KLH). Noel