Aren't you thinking of VSDRIVE.LOW?
Edit: Also, is there any way to load MouseDesk from floppy, but then have virtual drives to launch programs from (through MouseDesk)?
If you can load MouseDesk from floppy (which I don't know, I've never used it) then the version of VSDRIVE that overwrites the floppy driver ought to work (which is what I think A2CLOUD uses).
Also, could you give me a list of software that is VSDRIVE compatible? And I thought VSDRIVE loaded in in place of the floppy driver. (Which MouseDesk doesn't overwrite.)
I don't have a list... if you're overwriting the floppy driver, then any ProDOS software ought to work. You'd have to ask Ivan specific questions about how A2CLOUD behaves and what to expect; I'm honestly not an expert there. I only supply the driver.