[PSDK] Add IDCANCEL and IDASYNC values (returned by MessageBoxTimeout() and WTSSendMessage() functions).

sdk/include/psdk/winuser.h

@@ -836,6 +836,11 @@ extern "C" {
 #define IDTRYAGAIN 10
 #define IDCONTINUE 11
 #endif
+#if (WINVER >= 0x0501)
+#ifndef IDTIMEOUT
+#define IDTIMEOUT 32000
+#endif
+#endif
 
 #define GWL_EXSTYLE (-20)
 #define GWL_STYLE (-16)

sdk/include/psdk/wtsapi32.h

@@ -23,6 +23,16 @@
 extern "C" {
 #endif
 
+/*
+ * pResponse values from WTSSendMessage(), in addition
+ * to those from the standard MessageBox() API.
+ */
+#ifndef IDTIMEOUT
+#define IDTIMEOUT 32000
+#endif
+#ifndef IDASYNC
+#define IDASYNC   32001
+#endif
 
 typedef enum _WTS_VIRTUAL_CLASS
 {