Expect multiple DNS_ flags.
Partially implemented DdeEnableCallback.
Call a callback with XTYP_CONNECT_CONFIRM after an accepted
XTYP_CONNECT.
Added traces, clarify data types, other cosmetics.

diff --git a/include/ddeml.h b/include/ddeml.h
index 8062799..5f4c82a 100644
--- a/include/ddeml.h
+++ b/include/ddeml.h
@@ -90,6 +90,15 @@
 #define     ST_ISSELF               0x0100
 
 /*
+ * DdeEnableCallback function codes
+ */
+
+#define     EC_ENABLEALL                 0
+#define     EC_ENABLEONE                 ST_BLOCKNEXT
+#define     EC_DISABLE                   ST_BLOCKED
+#define     EC_QUERYWAITING              2
+
+/*
  * Callback filter flags for use with standard apps.
  */