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Change the users shortcut for running the application so it points to a batch file. &nbsp;In the batch file include a kill command, probably a wait command to last for 5 seconds, then a command to launch the application. &nbsp;<br />
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Then if he tries to open the application and it is already open the kill command will close it and launch a fresh instance of the application that he can see.
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Change the users shortcut for running the application so it points to a batch file.  In the batch file include a kill command, probably a wait command to last for 5 seconds, then a command to launch the application.  

Then if he tries to open the application and it is already open the kill command will close it and launch a fresh instance of the application that he can see.

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So do I get any points for recommending use of a script? &nbsp;That's what you've done.
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So do I get any points for recommending use of a script?  That's what you've done.

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One of our users keeps opening the same application numerous times which causes him problems. &nbsp;What I need is a way (program, application etc.) that will stop more than one instance of a particular, definable .exe from running and a method to prevent WIndows XP from hiding the application in the system tray. &nbsp;If I can either diable the system tray auto hide feature or prevent a particular application from hiding and prevent more than one particular .exe from runningat a time, I'm in business!
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One of our users keeps opening the same application numerous times which causes him problems.  What I need is a way (program, application etc.) that will stop more than one instance of a particular, definable .exe from running and a method to prevent WIndows XP from hiding the application in the system tray.  If I can either diable the system tray auto hide feature or prevent a particular application from hiding and prevent more than one particular .exe from runningat a time, I'm in business!

Prevent multiple instances of a single application from running

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of programs, libraries and related non-executable data (such as documentation). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level programming languages than machine language. High-level languages are translated into machine language using a compiler or interpreter or a combination of the two.