PostScript Level 2 is the latest release of the PostScript language
specification. It basically provides a few additional enhancements, mainly
in the realms of colour printing, but there are some extra commands and
features on the b&w side too.
As for ProPage `supporting' it, it would only be a case of PPage generating
PostScript Level 2 code … but there's really not a lot of point since the
Level 1 code it produces will work and do exactly the same on a Level 2
printer. I suppose there might be a case for PPage to produce PS2 code in
the future, to make things run a bit faster, it probably isn't worth it at
this stage … if PS2 code were to be generated, I would guess that it's
just going to be a case of modifying the PostScript prolog to selectively
use the Level 2 features if they're available.
And, since PPage doesn't read or manipulate PostScript code, then `support'
isn't needed.
Mike