[HECnet] Disallow login on DZ line in VMS

[Paul Koning]

> On Dec 20, 2021, at 3:54 PM, Mark J. Blair <nf6x at nf6x.net> wrote:
> 
> The recent thread "Disallow system from dz lines (OpenVMS/VAX 7.3)" started me wondering how to entirely disable the login prompts on a given serial line, such as to use the port for some other purpose like controlling external hardware. I've been trying to find out how to do that in the manuals, but I haven't found it yet. It seems like it might be something to do with SET TERM, but I don't see obvious flags for that. Can anybody offer any hints? I won't be too surprised if my eyes have already glided over the answer in the manuals and HELP SET TERM text.

I don't know the VMS answer but I can give the RSTS answer: in V9 (I think) and later, set terminal/nointeractive" means the terminal can only be used as an application I/O device or DECnet line, not as a login terminal.  The feature was introduced to avoid starting the login program on the line in case random characters happened to appear -- that would make the line "in use" and prevent its use by, say, a printer spooler.

	paul