[sillywalk]

Thanks for the info. I feel sort of dunning-kruger :)

So, the 1st environment, which sounds like a real fun time, would be accessed by the 3270 screen-oriented terminal emulator, , and the z/OS Unix is accessed by something like SSH?

[lboc]

Yes and Yes. Though there are options to get to the Unix shell via tn3270 too.