Man pages matching name dialog_player in section 3alleg4:

DIALOG_PLAYER.3alleg4.en	debian 10 / allegro4-doc
DIALOG_PLAYER.3alleg4.en	debian 11 / allegro4-doc
DIALOG_PLAYER.3alleg4.en	debian 12 / allegro4-doc
DIALOG_PLAYER.3alleg4.en	debian 13 / allegro4-doc