diff --git a/acatcher/README b/acatcher/README
index 0f5d57d..b7a3370 100644
--- a/acatcher/README
+++ b/acatcher/README
@@ -3,6 +3,8 @@ host side:
 
 apt-get install libopencv-dev
 clang++ -O2 -lopencv_core -lopencv_highgui -lopencv_imgproc -o acatcher acatcher.cxx
+(add -DSHOWALL to get all windows up at once, and change "const int MAX" to
+reduce the number of windows up at once.)
 
 to actually run it:
 ./acatcher | (aplay -t raw -c 1 -f S16_LE -r 22050 > /dev/null 2> /dev/null)
diff --git a/acatcher/acatcher.cxx b/acatcher/acatcher.cxx
index e644607..41fe6ba 100644
--- a/acatcher/acatcher.cxx
+++ b/acatcher/acatcher.cxx
@@ -39,6 +39,8 @@ THE SOFTWARE.
 using namespace cv;
 using namespace std;
 
+const int MAX = 16;
+
 const char *names[] = {
 	"0",
 	"1",
@@ -64,7 +66,6 @@ void cls()
 }
 
 int baseport = 4000;
-const int MAX = 16;
 
 const int BUFLEN = 1024*1024;  // in bytes
 //const int ABUFLEN = 1024; // in words
@@ -72,6 +73,12 @@ const int BUFLEN = 1024*1024;  // in bytes
 // Yes this is ugly.  :P
 bool failure = false;
 
+#ifdef SHOWALL
+	bool showall = true;
+#else
+	bool showall = false;
+#endif
+
 struct sockin {
 	int listener_fd, data_fd;
 	struct sockaddr_in serv_addr, cli_addr;
@@ -149,6 +156,8 @@ struct audio_sockin : public sockin {
 
 const int IBUFLEN = 2048*1024;  // in bytes
 
+bool displayed = false;
+
 struct image_sockin : public sockin {
 	uint8_t buf[IBUFLEN];
 	int bufsize;
@@ -158,16 +167,16 @@ struct image_sockin : public sockin {
 	}
 
 	void showImage(int begin, int end, int listener) {
-		if (listener == id) {
+		if (showall || (listener == id)) {
 			Mat imgbuf = cv::Mat(480, 640, CV_8U, &buf[begin]);
 			Mat imgMat = cv::imdecode(imgbuf, CV_LOAD_IMAGE_COLOR);
 
 			if (!imgMat.data) cerr << "reading failed\r\n";
 //			cerr << "x " << imgMat.rows << ' ' << imgMat.cols << "\r\n";
 
-			imshow("Display Window", imgMat);
+			imshow(showall ? names[id] : "Display Window", imgMat);
 //			cerr << "updated\r\n";
-			waitKey(1);
+			displayed = true;
 		}
 	} 
 	
@@ -201,9 +210,6 @@ struct image_sockin : public sockin {
 		}
 
 
-//		if (listener == id) {
-//			if (have_fd3) write(3, data, len);
-//		}
 	}
 
 	virtual void newconn() {
@@ -273,7 +279,14 @@ int main(void)
 	if (have_fd3) cerr << "Have video output socket\n";
 #endif
 //	namedWindow("Display Window", WINDOW_AUTOSIZE );
-	namedWindow("Display Window", WINDOW_AUTOSIZE );
+
+	if (showall) {
+		for (int i = 0; i < MAX; i++) {
+			namedWindow(names[i], WINDOW_AUTOSIZE );
+		}
+	} else {
+		namedWindow("Display Window", WINDOW_AUTOSIZE );
+	}
 
 	// catch signals
 	if (((void *)signal(SIGINT,sigcatch) < 0) ||
@@ -365,6 +378,7 @@ int main(void)
 			}
 		}
 
+		displayed = false;
 		for (int i = 0; (rv > 0) && (i < num_sockets); i++) {
 			if (!s[i]) break;
 
@@ -408,6 +422,7 @@ int main(void)
 				}
 			}
 		}
+		if (displayed) waitKey(1);
 	};
 
 
diff --git a/external/happycube b/external/happycube
index 7918f6c..7acccfe 160000
--- a/external/happycube
+++ b/external/happycube
@@ -1 +1 @@
-Subproject commit 7918f6c2650811d0254f8a541634e999cb674daa
+Subproject commit 7acccfe272023de74864b1a83eee9ddbac9b8fd4