Question juridique clé
Whether the public-law appeal was admissible against the denial of party status in a denunciation-based administrative procedure.
Solution extraite
The appeal was admissible only to the limited extent of challenging the denial of party status.
Motifs extraits
A complainant generally cannot attack a mere non-action or refusal to act on a denunciation by public-law appeal, but may still contest being wrongly denied party status.