diff --git a/src/java/com/threerings/presents/data/AuthCodes.java b/src/java/com/threerings/presents/data/AuthCodes.java
new file mode 100644
index 000000000..4ebe17a84
--- /dev/null
+++ b/src/java/com/threerings/presents/data/AuthCodes.java
@@ -0,0 +1,21 @@
+//
+// $Id: AuthCodes.java,v 1.1 2002/07/12 16:17:45 mdb Exp $
+
+package com.threerings.presents.data;
+
+/**
+ * Basic authentication response codes.
+ */
+public interface AuthCodes
+{
+    /** A code indicating that no user exists with the specified
+     * username. */
+    public static final String NO_SUCH_USER = "m.no_such_user";
+
+    /** A code indicating that the supplied password was invalid. */
+    public static final String INVALID_PASSWORD = "m.invalid_password";
+
+    /** A code indicating that an internal server error occurred while
+     * trying to log the user on. */
+    public static final String SERVER_ERROR = "m.server_error";
+}