as for the term P-lager, I think that any beer using an ale yeast but designed to emulate either a particular lager style (such as pilsner) or minimize the effects of the ale yeast could be called Pseudo....I would call many blonde or summer ales that utilize neutral yeasts and other ingredients and processes (lowered ferm temp, lagering, filtering, beano, adding corn or rice adjuncts, whatever, etc.) to get a thirst quenching or drier beer a P-lager.
I would call any neutral ale yeast or those that work at lower temps pseudo lager yeasts, but I don't think I would call Alt or Kolsch Pseudo Lagers, as they are already classified as German Ales (or Old as in Alt Style).
I would call Anchor a Pseudo Ale....being a lager brewed at ale temps...but I like the term Steam or alternately California Common (back to designating where the practice was common).
Short answer, in my opinion: Pseudo Lagers=Summer Ales