Added coded stubs for DdeQueryConvInfo (16 & 32 bit), DdeAddData (32
bit), DdeAbandonTransaction (32 bit), DdeImpersonateClient (32)
DdeSetQualityOfService, DdeSetUserHandle.
Corrected heap handling in DdeInitializeW, refined CreateMutex error
handling.
General tidying.

diff --git a/include/winnt.h b/include/winnt.h
index 216e4a2..35e02c3 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -556,6 +556,18 @@
 } SECURITY_IMPERSONATION_LEVEL; 
 
 
+typedef BOOLEAN SECURITY_CONTEXT_TRACKING_MODE,
+	* PSECURITY_CONTEXT_TRACKING_MODE;
+//
+//	Quality of Service
+//
+
+typedef struct _SECURITY_QUALITY_OF_SERVICE {
+  DWORD				Length;
+  SECURITY_IMPERSONATION_LEVEL	ImpersonationLevel;
+  SECURITY_CONTEXT_TRACKING_MODE ContextTrackingMode;
+  BOOL				EffectiveOnly;
+} SECURITY_QUALITY_OF_SERVICE, *PSECURITY_QUALITY_OF_SERVICE;
 
 /*
  * TOKEN_STATISTICS