Hi
We dispatch A340 as well so had a look. We don't have Q included, and it is not listed in any of our books so can't help on that one.
As to letter P
Before the / is P-RNAV (should also have letter R as well)
After the / is SSR equipment Mode S with press ALT, but without ACFT ID transmission.
Hope this helps, but remember, I'm only a dispatcher :-)
Expat