CHKO
CHKO(RELEASE_OVERLAY);
CHKO(CONFIGURE_OVERLAY);
CHKO(OVERLAY_COUNT);
CHKO(OVERLAY_SUPPORTED_SPACES);
CHKO(OVERLAY_SUPPORTED_FEATURES);
CHKO(ALLOCATE_OVERLAY_BUFFER);
CHKO(RELEASE_OVERLAY_BUFFER);
CHKO(GET_OVERLAY_CONSTRAINTS);
CHKO(ALLOCATE_OVERLAY);
CHKO(CONFIGURE_OVERLAY);
CHKO(OVERLAY_COUNT);
CHKO(OVERLAY_SUPPORTED_SPACES);
CHKO(OVERLAY_SUPPORTED_FEATURES);
CHKO(ALLOCATE_OVERLAY_BUFFER);
CHKO(RELEASE_OVERLAY_BUFFER);
CHKO(GET_OVERLAY_CONSTRAINTS);
CHKO(ALLOCATE_OVERLAY);
CHKO(RELEASE_OVERLAY);
CHKO(OVERLAY_COUNT);
CHKO(OVERLAY_SUPPORTED_SPACES);
CHKO(OVERLAY_SUPPORTED_FEATURES);
CHKO(ALLOCATE_OVERLAY_BUFFER);
CHKO(RELEASE_OVERLAY_BUFFER);
CHKO(GET_OVERLAY_CONSTRAINTS);
CHKO(ALLOCATE_OVERLAY);
CHKO(RELEASE_OVERLAY);
CHKO(CONFIGURE_OVERLAY);
CHKO(RELEASE_OVERLAY);
CHKO(CONFIGURE_OVERLAY);
CHKO(OVERLAY_COUNT);
CHKO(OVERLAY_SUPPORTED_SPACES);
CHKO(OVERLAY_SUPPORTED_FEATURES);
CHKO(ALLOCATE_OVERLAY_BUFFER);
CHKO(RELEASE_OVERLAY_BUFFER);
CHKO(GET_OVERLAY_CONSTRAINTS);
CHKO(ALLOCATE_OVERLAY);