diff --git a/backend_canonselphy.c b/backend_canonselphy.c
index e191594..24fc4b2 100644
--- a/backend_canonselphy.c
+++ b/backend_canonselphy.c
@@ -642,8 +642,8 @@ static void *canonselphy_init(void)
 
 extern struct dyesub_backend canonselphy_backend;
 
-static void canonselphy_attach(void *vctx, struct libusb_device_handle *dev,
-			       uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int canonselphy_attach(void *vctx, struct libusb_device_handle *dev,
+			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct canonselphy_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -672,7 +672,11 @@ static void canonselphy_attach(void *vctx, struct libusb_device_handle *dev,
 	}
 	if (!ctx->printer) {
 		ERROR("Error looking up printer type!\n");
+		return CUPS_BACKEND_FAILED;
 	}
+
+	/* TODO:  Query & Update Marker */
+	return CUPS_BACKEND_OK;
 }
 
 static void canonselphy_teardown(void *vctx) {
diff --git a/backend_canonselphyneo.c b/backend_canonselphyneo.c
index 5a208a5..9152e0b 100644
--- a/backend_canonselphyneo.c
+++ b/backend_canonselphyneo.c
@@ -189,8 +189,8 @@ static void *selphyneo_init(void)
 
 extern struct dyesub_backend selphyneo_backend;
 
-static void selphyneo_attach(void *vctx, struct libusb_device_handle *dev,
-				  uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int selphyneo_attach(void *vctx, struct libusb_device_handle *dev,
+			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct selphyneo_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -204,6 +204,10 @@ static void selphyneo_attach(void *vctx, struct libusb_device_handle *dev,
 
 	device = libusb_get_device(dev);
 	libusb_get_device_descriptor(device, &desc);
+
+	// TODO:  Query & Update Marker
+
+	return CUPS_BACKEND_OK;
 }
 
 static void selphyneo_teardown(void *vctx) {
diff --git a/backend_common.c b/backend_common.c
index 55f9fd1..03bf34e 100644
--- a/backend_common.c
+++ b/backend_common.c
@@ -29,7 +29,7 @@
 
 #include "backend_common.h"
 
-#define BACKEND_VERSION "0.80"
+#define BACKEND_VERSION "0.81"
 #ifndef URI_PREFIX
 #error "Must Define URI_PREFIX"
 #endif
diff --git a/backend_common.h b/backend_common.h
index 4f1e810..57250f0 100644
--- a/backend_common.h
+++ b/backend_common.h
@@ -156,7 +156,7 @@ struct dyesub_backend {
 	const char **uri_prefixes;
 	void (*cmdline_usage)(void);  /* Optional */
 	void *(*init)(void);
-	void (*attach)(void *ctx, struct libusb_device_handle *dev,
+	int  (*attach)(void *ctx, struct libusb_device_handle *dev,
 		       uint8_t endp_up, uint8_t endp_down, uint8_t jobid);
 	void (*teardown)(void *ctx);
 	int  (*cmdline_arg)(void *ctx, int argc, char **argv);
diff --git a/backend_dnpds40.c b/backend_dnpds40.c
index 5dba42e..3d8ff90 100644
--- a/backend_dnpds40.c
+++ b/backend_dnpds40.c
@@ -548,8 +548,8 @@ static void *dnpds40_init(void)
 	((ctx->ver_major > (__major)) || \
 	 (ctx->ver_major == (__major) && ctx->ver_minor >= (__minor)))
 
-static void dnpds40_attach(void *vctx, struct libusb_device_handle *dev,
-			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int dnpds40_attach(void *vctx, struct libusb_device_handle *dev,
+			  uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct dnpds40_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -629,7 +629,7 @@ static void dnpds40_attach(void *vctx, struct libusb_device_handle *dev,
 		libusb_get_string_descriptor_ascii(dev, desc->iManufacturer, (unsigned char*)buf, STR_LEN_MAX);
 		sanitize_string(buf);
 		if (strncmp(buf, "Dai", 3))
-			return 0;
+			return CUPS_BACKEND_FAILED;
 	}
 #endif
 #ifdef CITIZEN_ONLY   /* Only allow CITIZEN printers to work. */
@@ -639,7 +639,7 @@ static void dnpds40_attach(void *vctx, struct libusb_device_handle *dev,
 		libusb_get_string_descriptor_ascii(dev, desc->iManufacturer, (unsigned char*)buf, STR_LEN_MAX);
 		sanitize_string(buf);
 		if (strncmp(buf, "CIT", 3))
-			return 0;
+			return CUPS_BACKEND_FAILED;
 	}
 #endif
 
@@ -779,7 +779,7 @@ static void dnpds40_attach(void *vctx, struct libusb_device_handle *dev,
 		break;
 	default:
 		ERROR("Unknown vid/pid %04x/%04x (%d)\n", desc.idVendor, desc.idProduct, ctx->type);
-		return;
+		return CUPS_BACKEND_FAILED;
 	}
 
 	ctx->last_matte = -1;
@@ -923,6 +923,10 @@ static void dnpds40_attach(void *vctx, struct libusb_device_handle *dev,
 			break;
 		}
 	}
+
+	// TODO: fail out on other errors
+	// TODO: Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void dnpds40_teardown(void *vctx) {
diff --git a/backend_kodak1400.c b/backend_kodak1400.c
index 09bf62d..68fd57f 100644
--- a/backend_kodak1400.c
+++ b/backend_kodak1400.c
@@ -294,8 +294,8 @@ static void *kodak1400_init(void)
 	return ctx;
 }
 
-static void kodak1400_attach(void *vctx, struct libusb_device_handle *dev,
-			     uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int kodak1400_attach(void *vctx, struct libusb_device_handle *dev,
+			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct kodak1400_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -312,6 +312,8 @@ static void kodak1400_attach(void *vctx, struct libusb_device_handle *dev,
 
 	ctx->type = lookup_printer_type(&kodak1400_backend,
 					desc.idVendor, desc.idProduct);
+
+	return CUPS_BACKEND_OK;
 }
 
 static void kodak1400_teardown(void *vctx) {
diff --git a/backend_kodak605.c b/backend_kodak605.c
index 1bff486..1afe93d 100644
--- a/backend_kodak605.c
+++ b/backend_kodak605.c
@@ -234,8 +234,8 @@ static void *kodak605_init(void)
 	return ctx;
 }
 
-static void kodak605_attach(void *vctx, struct libusb_device_handle *dev,
-			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int kodak605_attach(void *vctx, struct libusb_device_handle *dev,
+			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct kodak605_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -262,7 +262,11 @@ static void kodak605_attach(void *vctx, struct libusb_device_handle *dev,
 	/* Query media info */
 	if (kodak605_get_media(ctx, ctx->media)) {
 		ERROR("Can't query media\n");
+		return CUPS_BACKEND_FAILED;
 	}
+
+	// TODO: Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void kodak605_teardown(void *vctx) {
diff --git a/backend_kodak6800.c b/backend_kodak6800.c
index cc2779e..a1c48a9 100644
--- a/backend_kodak6800.c
+++ b/backend_kodak6800.c
@@ -1012,8 +1012,8 @@ static void *kodak6800_init(void)
 	return ctx;
 }
 
-static void kodak6800_attach(void *vctx, struct libusb_device_handle *dev,
-			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int kodak6800_attach(void *vctx, struct libusb_device_handle *dev,
+			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct kodak6800_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -1040,7 +1040,11 @@ static void kodak6800_attach(void *vctx, struct libusb_device_handle *dev,
 	/* Query media info */
 	if (kodak6800_get_mediainfo(ctx, ctx->media)) {
 		ERROR("Can't query media\n");
+		return CUPS_BACKEND_FAILED;
 	}
+
+	// TODO: Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void kodak6800_teardown(void *vctx) {
diff --git a/backend_magicard.c b/backend_magicard.c
index 63f9e96..4cd97d8 100644
--- a/backend_magicard.c
+++ b/backend_magicard.c
@@ -451,7 +451,7 @@ static void* magicard_init(void)
 	return ctx;
 }
 
-static void magicard_attach(void *vctx, struct libusb_device_handle *dev,
+static int magicard_attach(void *vctx, struct libusb_device_handle *dev,
 			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct magicard_ctx *ctx = vctx;
@@ -470,6 +470,7 @@ static void magicard_attach(void *vctx, struct libusb_device_handle *dev,
 	ctx->type = lookup_printer_type(&magicard_backend,
 					desc.idVendor, desc.idProduct);
 
+	return CUPS_BACKEND_OK;
 }
 
 static void magicard_teardown(void *vctx) {
diff --git a/backend_mitsu70x.c b/backend_mitsu70x.c
index c989f54..9b59fa6 100644
--- a/backend_mitsu70x.c
+++ b/backend_mitsu70x.c
@@ -688,8 +688,8 @@ static void *mitsu70x_init(void)
 	return ctx;
 }
 
-static void mitsu70x_attach(void *vctx, struct libusb_device_handle *dev,
-			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int mitsu70x_attach(void *vctx, struct libusb_device_handle *dev,
+			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct mitsu70x_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -723,13 +723,13 @@ static void mitsu70x_attach(void *vctx, struct libusb_device_handle *dev,
 			ERROR("Problem resolving API Version symbol in imaging processing library, too old or not installed?\n");
 			DL_CLOSE(ctx->dl_handle);
 			ctx->dl_handle = NULL;
-			return;
+			return CUPS_BACKEND_FAILED;
 		}
 		if (ctx->GetAPIVersion() != REQUIRED_LIB_APIVERSION) {
 			ERROR("Image processing library API version mismatch!\n");
 			DL_CLOSE(ctx->dl_handle);
 			ctx->dl_handle = NULL;
-			return;
+			return CUPS_BACKEND_FAILED;
 		}
 
 		ctx->Get3DColorTable = DL_SYM(ctx->dl_handle, "CColorConv3D_Get3DColorTable");
@@ -750,6 +750,7 @@ static void mitsu70x_attach(void *vctx, struct libusb_device_handle *dev,
 			ERROR("Problem resolving symbols in imaging processing library\n");
 			DL_CLOSE(ctx->dl_handle);
 			ctx->dl_handle = NULL;
+			return CUPS_BACKEND_FAILED;
 		} else {
 			DEBUG("Image processing library successfully loaded\n");
 		}
@@ -777,7 +778,7 @@ static void mitsu70x_attach(void *vctx, struct libusb_device_handle *dev,
 	ret = mitsu70x_get_printerstatus(ctx, &resp);
 	if (ret) {
 		ERROR("Unable to get printer status! (%d)\n", ret);
-		return;
+		return CUPS_BACKEND_FAILED;
 	}
 
 	if (ctx->type == P_MITSU_D70X &&
@@ -786,6 +787,9 @@ static void mitsu70x_attach(void *vctx, struct libusb_device_handle *dev,
 		ctx->num_decks = 2;
 	else
 		ctx->num_decks = 1;
+
+	// TODO: Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void mitsu70x_teardown(void *vctx) {
diff --git a/backend_mitsu9550.c b/backend_mitsu9550.c
index 4eaac50..6b4ed9d 100644
--- a/backend_mitsu9550.c
+++ b/backend_mitsu9550.c
@@ -540,7 +540,7 @@ static void *mitsu9550_init(void)
 	return ctx;
 }
 
-static void mitsu9550_attach(void *vctx, struct libusb_device_handle *dev,
+static int mitsu9550_attach(void *vctx, struct libusb_device_handle *dev,
 			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct mitsu9550_ctx *ctx = vctx;
@@ -569,6 +569,9 @@ static void mitsu9550_attach(void *vctx, struct libusb_device_handle *dev,
 		ctx->is_98xx = 1;
 
 	ctx->last_donor = ctx->last_remain = 65535;
+
+	// TODO: Query & Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void mitsu9550_teardown(void *vctx) {
diff --git a/backend_mitsup95d.c b/backend_mitsup95d.c
index c6dbe71..ca09879 100644
--- a/backend_mitsup95d.c
+++ b/backend_mitsup95d.c
@@ -89,7 +89,7 @@ static void *mitsup95d_init(void)
 	return ctx;
 }
 
-static void mitsup95d_attach(void *vctx, struct libusb_device_handle *dev,
+static int mitsup95d_attach(void *vctx, struct libusb_device_handle *dev,
 			    uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct mitsup95d_ctx *ctx = vctx;
@@ -107,6 +107,8 @@ static void mitsup95d_attach(void *vctx, struct libusb_device_handle *dev,
 
 	ctx->type = lookup_printer_type(&mitsup95d_backend,
 					desc.idVendor, desc.idProduct);
+
+	return CUPS_BACKEND_OK;
 }
 
 static void mitsup95d_teardown(void *vctx) {
diff --git a/backend_shinkos1245.c b/backend_shinkos1245.c
index d62ae38..85991dc 100644
--- a/backend_shinkos1245.c
+++ b/backend_shinkos1245.c
@@ -1274,8 +1274,8 @@ static void *shinkos1245_init(void)
 	return ctx;
 }
 
-static void shinkos1245_attach(void *vctx, struct libusb_device_handle *dev,
-			       uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int shinkos1245_attach(void *vctx, struct libusb_device_handle *dev,
+			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct shinkos1245_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -1295,6 +1295,9 @@ static void shinkos1245_attach(void *vctx, struct libusb_device_handle *dev,
 	ctx->jobid = jobid & 0x7f;
 	if (!ctx->jobid)
 		ctx->jobid++;
+
+	/* TODO: Query & Update Marker */
+	return CUPS_BACKEND_OK;
 }
 
 
diff --git a/backend_shinkos2145.c b/backend_shinkos2145.c
index 2a2bd99..c070d67 100644
--- a/backend_shinkos2145.c
+++ b/backend_shinkos2145.c
@@ -1401,8 +1401,8 @@ static void *shinkos2145_init(void)
 	return ctx;
 }
 
-static void shinkos2145_attach(void *vctx, struct libusb_device_handle *dev,
-			       uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int shinkos2145_attach(void *vctx, struct libusb_device_handle *dev,
+			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct shinkos2145_ctx *ctx = vctx;
 
@@ -1417,6 +1417,9 @@ static void shinkos2145_attach(void *vctx, struct libusb_device_handle *dev,
 
 	/* Initialize donor */
 	ctx->last_donor = ctx->last_remain = ctx->media_prints = 65535;
+
+	// TODO: Query & Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void shinkos2145_teardown(void *vctx) {
diff --git a/backend_shinkos6145.c b/backend_shinkos6145.c
index bd2c3a8..064b472 100644
--- a/backend_shinkos6145.c
+++ b/backend_shinkos6145.c
@@ -1911,8 +1911,8 @@ static void *shinkos6145_init(void)
 	return ctx;
 }
 
-static void shinkos6145_attach(void *vctx, struct libusb_device_handle *dev,
-			       uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int shinkos6145_attach(void *vctx, struct libusb_device_handle *dev,
+			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct shinkos6145_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -1956,6 +1956,9 @@ static void shinkos6145_attach(void *vctx, struct libusb_device_handle *dev,
 
 	/* Initialize donor */
 	ctx->last_donor = ctx->last_remain = 65535;
+
+	// TODO: Query & Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void shinkos6145_teardown(void *vctx) {
diff --git a/backend_shinkos6245.c b/backend_shinkos6245.c
index 593e33d..0a7af9a 100644
--- a/backend_shinkos6245.c
+++ b/backend_shinkos6245.c
@@ -1493,8 +1493,8 @@ static void *shinkos6245_init(void)
 	return ctx;
 }
 
-static void shinkos6245_attach(void *vctx, struct libusb_device_handle *dev,
-			       uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int shinkos6245_attach(void *vctx, struct libusb_device_handle *dev,
+			      uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct shinkos6245_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -1517,6 +1517,9 @@ static void shinkos6245_attach(void *vctx, struct libusb_device_handle *dev,
 
 	/* Initialize donor */
 	ctx->last_donor = ctx->last_remain = 65535;
+
+	// TODO: Query & Update Marker
+	return CUPS_BACKEND_OK;
 }
 
 static void shinkos6245_teardown(void *vctx) {
diff --git a/backend_sonyupdr150.c b/backend_sonyupdr150.c
index 0c8d37c..e71d934 100644
--- a/backend_sonyupdr150.c
+++ b/backend_sonyupdr150.c
@@ -71,8 +71,8 @@ static void* updr150_init(void)
 	return ctx;
 }
 
-static void updr150_attach(void *vctx, struct libusb_device_handle *dev,
-			   uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
+static int updr150_attach(void *vctx, struct libusb_device_handle *dev,
+			  uint8_t endp_up, uint8_t endp_down, uint8_t jobid)
 {
 	struct updr150_ctx *ctx = vctx;
 	struct libusb_device *device;
@@ -91,6 +91,8 @@ static void updr150_attach(void *vctx, struct libusb_device_handle *dev,
 					desc.idVendor, desc.idProduct);
 
 	ctx->copies_offset = 0;
+
+	return CUPS_BACKEND_OK;
 }
 
 static void updr150_teardown(void *vctx) {