(soz, late reply)
I'm sure that it can be used for all programs! (:
It is just a guideline sort of thing after all.
If you want some specifics:
I made this tut using an adjusted airbrush (sketching + colouring) and brush (for rough blending) in SAI
in PS, the equivalent tools would be the brush and the mixer brush
in other programs, it would be etc etc.