S_MOUNT
mount_unmount (S_MOUNT, printer, NB(form), NB(pwheel));
mount_unmount (S_MOUNT, printer, NB(form), NB(pwheel));
type = (type == S_MOUNT ? S_MOUNT_TRAY : S_UNMOUNT_TRAY);
(void) getmessage(m, S_MOUNT, &printer, &form, &pwheel_name);