The thing I don’t quite understand about slide is if you are tuned to for example open E, the slide then covers all the strings. That surely gives you a limited range of chords as you go up the neck, sharp, flat etc.
I should look at the Ariel Posen lesson above that @CT suggested and try to get a better understanding of the process.
You are correct in that as you move up the neck you will get the progression of chords F, F#, G etc. But you also have the option to make other shapes, I think, but not sure if you can do that with a slide. What happens if you fret notes between the slide and the nut? Maybe I should look at the tutorial as well … blind talking with the blind here 
You would be able to play individual notes to play arpeggios and perhaps double stops?
Not really, all the major chords are there and they repeat at the 12th fret as they do with standard tuning. Minor chords are more of a challenge with open tuning, as some fingering is required, which is why I-IV-V major blues progressions are huge with slide guitar.
Good question Gordon but my understanding most is in Open tuning
Open E ie E-B-E-G♯-B-E would give you 1 5 1 3 5 1 and that would repeat up the neck for the Major chords, the thickest 3 strings would give you a power chord that could imply a minor or you could stretch up 3 frets with a finger on the 4th string to play the b3 and mute the 3 on the G string. Or play the b3 on the E strings and somehow mute the 3 which don’t seem easy !!
The other Keys would give a similar 1 3 5 combo across the neck and you need to find that b3 elsewhere for minor chords. Nightmare.
Clint may explain as I am only working out possibilities in my head ! 
Hi Clint,
I’ve always liked slide guitar - was toying with getting a resonator and trying to learn to play some slide - then remembered how lazy I am. 
Loved this.
Very cheery on a somewhat grey day.
Digger
Good point! Bar 2 or 3 of the thickest strings to make a power chord. Otherwise you have to flatten the 3rd to make a minor chord.