You might try this (BTW I have not tried the destroy method before and I cannot be certain it will allow you to save unsaved data or not so beware)

1. // Declare a Process variable for each process
2. Process pNotePad, pKeyboard;
3. 
   
4. // start the process
5. pNotePad = open(new String[] { "notepad.exe } ); // Windows NotePad
6. 
   
7. // when you are ready to close the application
8. pNotePad.destroy();

1. public void onscreenKbd_click1(GButton source, GEvent event) { //_CODE_:onscreenKbd:528381:
     calibPNL.setVisible(false);
     remotePNL.setVisible(false);
     typePNL.setVisible(true);
     blankPNL.setVisible(false);
2. 
     println("KEYBOARD!!!!");
3. 
     if (keyboardOnOff == false){
          pKeyboard = open(new String[] { "c:/Windows/system32/osk.exe" } ); // Windows Keyboard
          keyboardOnOff=!keyboardOnOff;
4. 
          println("keyboardOnOff= "+keyboardOnOff);
5. 
        }else
6. {
7. pKeyboard.destroy();
8. 
      keyboardOnOff=!keyboardOnOff;
    println("keyboardOnOff= "+keyboardOnOff);
    }