Frank, I hold the guitar upright and place the slide on my left ring finger. I don't mute much behind the sile like many instructional videos advise because I like the rattles and pops to provide a percussive rythm. My technique is a combination of bass line in the right thumb, barr chord accomapnying single string picking using fingering or slide. I find it really hard to describe! It's not so hard to do.

Murray, The term round neck just means that the fret board has a radius like all modern guitars. OMI (the company that produced Dobros until '97 built a wood body guitar with a neck with a 7.1/2" neck radius, a short neck (12 frets to the body.) I also have a Duolian with a flat neck which many Dobros have but it's not a reinforced neck for playing like a lap steel. It's a bottleneck guitar.

I keep the Duolian in open G and the F60 in open D.