Quiting applications gracefully from within LV

Hello,
Attached is an example VI that can be used to open and close a third party application. It does this using the System Exec vi and the windows comand line 'tskill'. The VI will prompt the user to go back to the application and save any changes.
Is there an alternative comand line or method which will close the application gracefully, so it asks the user to save changes directly (the same as when the application is quit manually or it is closed by windows shutting down)?
I am using XP sp3 and LV 8.6 (not very familiar with Windows comand lines etc though).
Thanks,
Blue
Attachments:
Open close app from LV example.vi ‏24 KB

Hello smercurio thanks for that link, very welcome! i have spent the last couple of days searching for something like that with no success. It contains the building blocks to do what i need.
The comments below are so that hopefully some other nubie will come across the solution more easily than i did... (as search terms are easy once you know them - eg searching the forum for user32 and lvutil32 gives me no hits).
How to begin to interact and manipulate with third party applications and windows from a LabView VI.
The 'Call Library Function Node' alows LV to communicate with .dll (dynamic link library) files.
The Windows API .dll for interacting with desktop windows is called 'user32.dll'
Examples of LabView VIs calling user32.dll can be found in Lvutil32 at:
http://zone.ni.com/devzone/cda/epd/p/id/2556
The VIs in Lvutil32 use both user32.dll and lvutil32.dll.
User32.dll is part of Windows.
Lvutil32.dll is not part of windows and will need to be included with any VIs that call it.
For VIs using windows command lines to launch applications it is necessary to include the full path to the application. Obviously moving the application from the path will cause an error. Alternatively you can edit the 'Path' entry in Control Panel > System Properties > Advanced > Environmental Variables > System Variables > Path to include the path to the application to be launched. This will mean that only the name of the application executable is needed.
A great VI for experimenting sending simulated key strokes to the active application is Virtual Keyboard.vi posted at the link below by Peter (though you may need to reduce the 'Delay' input).
http://forums.ni.com/ni/board/message?board.id=270&message.id=839&query.id=2019#M839
Comments, additions and corrections welcomed.
Thanks again for the support, Blue

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