There are some ?SEL* substitutions (select,doc, subst.doc), but they only report info for the first residue in the selection. However, you can loop over selected atoms via the .SUBSET. operator (select.doc), which may be useful.
Aiii, I totally forgot .SUBSET.!
This will do, since I don't really need to know each RESID in the selection personally and by ID ;-)
Thanks a lot!