diff --git a/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/ConfiguredGuacamoleSocket.java b/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/ConfiguredGuacamoleSocket.java
index 094527801..5856b6cd3 100644
--- a/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/ConfiguredGuacamoleSocket.java
+++ b/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/ConfiguredGuacamoleSocket.java
@@ -129,8 +129,13 @@ public class ConfiguredGuacamoleSocket implements GuacamoleSocket {
         GuacamoleReader reader = socket.getReader();
         GuacamoleWriter writer = socket.getWriter();
 
-        // Send protocol
-        writer.writeInstruction(new GuacamoleInstruction("select", config.getProtocol()));
+        // Get protocol / connection ID
+        String select_arg = config.getConnectionID();
+        if (select_arg == null)
+            select_arg = config.getProtocol();
+
+        // Send requested protocol or connection ID
+        writer.writeInstruction(new GuacamoleInstruction("select", select_arg));
 
         // Wait for server args
         GuacamoleInstruction args = expect(reader, "args");
diff --git a/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/GuacamoleConfiguration.java b/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/GuacamoleConfiguration.java
index 714bbc6c0..6140f9fc5 100644
--- a/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/GuacamoleConfiguration.java
+++ b/guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/GuacamoleConfiguration.java
@@ -42,6 +42,12 @@ public class GuacamoleConfiguration implements Serializable {
      */
     private static final long serialVersionUID = 1L;
 
+    /**
+     * The ID of the connection being joined. If this value is present,
+     * the protocol need not be specified.
+     */
+    private String connectionID;
+    
     /**
      * The name of the protocol associated with this configuration.
      */
@@ -52,6 +58,28 @@ public class GuacamoleConfiguration implements Serializable {
      */
     private Map<String, String> parameters = new HashMap<String, String>();
 
+    /**
+     * Returns the ID of the connection being joined, if any. If no connection
+     * is being joined, this returns null, and the protocol must be set.
+     *
+     * @return The ID of the connection being joined, or null if no connection
+     *         is being joined.
+     */
+    public String getConnectionID() {
+        return connectionID;
+    }
+
+    /**
+     * Sets the ID of the connection being joined, if any. If no connection
+     * is being joined, this value must be omitted, and the protocol must be
+     * set instead.
+     *
+     * @param connectionID The ID of the connection being joined.
+     */
+    public void setConnectionID(String connectionID) {
+        this.connectionID = connectionID;
+    }
+
     /**
      * Returns the name of the protocol to be used.
      * @return The name of the protocol to be used.