--- a/WinWorkstation.st	Fri May 24 13:52:10 2019 +0200
+++ b/WinWorkstation.st	Fri May 24 16:35:27 2019 +0200
@@ -15597,9 +15597,24 @@
     "initialize the receiver for a connection to a display;
      the argument, aDisplayName may be nil (for the default display)
      or the name of the display server as hostname:number
-     (not yet under WIN32)"
-
-%{  /* NOCONTEXT */
+     (not yet under WIN32)
+
+     Fetch the process session id before opening the display.
+     For Windows Vista and later the process session id is 0 
+     in the case the process runs within service environment
+     if the process runs within logged-in user environment the session id is greater than 0,
+     see https://stackoverflow.com/questions/207896/c-net-detect-whether-program-is-being-run-as-a-service-or-a-console-applicati"
+
+%{  /* NOCONTEXT */
+    DWORD sessionId;
+
+    if (!ProcessIdToSessionId(GetCurrentProcessId(), &sessionId)) {
+        printf("ProcessIdToSessionId failed with %d\n", GetLastError());
+    };
+
+    if (sessionId == 0) {
+        RETURN ( __MKSMALLINT(0) );
+    }
 
     RETURN ( __MKSMALLINT(1) );
 %}.