On Thu, 15 Aug 1996, The Great Mr. Kurtz [David A. Gatwood] wrote:

> That's the only way I can think of is
> to merge with either dt or xterm or something running under x.

The X server already has built-in screen blanking.  I've heard that R6
also has hooks for a user-supplied screen saver, and then there's also
things like xlockmore and the like...

But there is no reason this couldn't be built into dt.