What is the use case for this? I can't imagine that I would be doing a lot of hardcore development on a machine that wasn't my dev machine which has Dash on it.
How about screen real estate? If you have a super crowded monitor, you can take advantage of a mobile screen that is otherwise underutilized?
That's exactly it. I've been waiting for this since Dash first came out. At the time I was doing iOS dev in a lot of coffee shops and airports with spotty wifi on an 11" MacBook Air. This would have been perfect then, having searchable offline docs on a second screen! Even though I'm working in an office most of the time now, I still bought it to use on my iPad.
I would still rather cmd+tab and copy&paste into a desktop app than carry around an extra device to view docs, personally.
Coding in Vim on a Raspberry Pi with a really small screen.
It doesn't solve your screen size issue (or if you're not using a gui on your Pi), but it's worth noting that Zeal (http://zealdocs.org/) is compatible with Dash's docsets and runs on Linux and Windows.