Index: simulator/run.py
===================================================================
diff -u -r69b2aacf31c5fdc28e078f87dbdee5c3ab672dd1 -ra3c7851a7de7cbed6b06abef5033b35308c04c93
--- simulator/run.py	(.../run.py)	(revision 69b2aacf31c5fdc28e078f87dbdee5c3ab672dd1)
+++ simulator/run.py	(.../run.py)	(revision a3c7851a7de7cbed6b06abef5033b35308c04c93)
@@ -1,11 +1,28 @@
 """
+###########################################################################
+#
+# Copyright (c) 2020-2026 Diality Inc. - All Rights Reserved.
+#
+# THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
+# WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
+#
+# @file    run.py
+#
+# @author  (last)      Behrouz NematiPour
+# @date    (last)      24-Feb-2021
+# @author  (original)  Behrouz NematiPour
+# @date    (original)  19-Aug-2020
+#
+############################################################################
 the main function
 to load the main simulator loader widget
 """
 import sys
-from dialin.squish import utils
+from dialin.ui import utils
 from PySide2 import QtCore, QtWidgets
 from simulator.loader import Simulator
+from dialin.ui.hd_simulator import HDSimulator
+from dialin.ui.hd_simulator_alarms import HDAlarmsSimulator, HIGH
 
 
 def main():
@@ -21,12 +38,30 @@
     simulator = Simulator()
     simulator.show()
 
+    hd_simulator_instance_counter_check()
+
     utils.tstDone()
 
     # start qt application main loop
     sys.exit(app.exec_())
 
 
+def hd_simulator_instance_counter_check():
+    """
+    Checks to make sure only one instance of the HDSimulator has been created.
+    this code shall be part of the HDSimulator __init__ but other codes are not ready for this.
+    so only the simulator is checking it now.
+    """
+    if HDSimulator.instanceCount > 1:
+        raise Exception("more than one instance of HDSimulator shall not be created.")
+    else:
+        if HDAlarmsSimulator.instanceCount > 1:
+            raise Exception("more than one instance of HDAlarmsSimulator shall not be created.")
+        else:
+            print("HDAlarmsSimulator number of instances is ", HDAlarmsSimulator.instanceCount)
+        print("HDSimulator number of instances is ", HDSimulator.instanceCount)
+
+
 if __name__ == "__main__":
     QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_ShareOpenGLContexts)
     main()