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    <p>I see your code is working. That's great. However I'm posting this to help you learn. I see a couple small issues with your code. For example in your repeat loop you tell system events to keystroke "h". There's no need to tell system events to do that in that line because you're already in a system events tell block of code, so system events already knows to do that.</p> <p>Here's how I would write your code. This doesn't require keystrokes, which is always a good thing, and is a little more efficient. It works because if the process doesn't exist then the "set theProcess to" line errors, the code then goes into the "on error" section to delay 5, then the repeat loop tries to find the process again. If the process is found then it sets its visible property which is the same as hiding it. </p> <p>It also has a timeout mechanism to prevent the script from running forever. Use this if you like. Good luck.</p> <pre><code>set processName to "WirelessUtilityCardbusPCI" set maxTime to 180 -- we only check for 3 minutes, then end set inTime to current date repeat try tell application "System Events" set theProcess to first process whose name is processName set visible of theProcess to false end tell exit repeat on error if (current date) - inTime is greater than maxTime then tell me activate display dialog "The process " &amp; processName &amp; " could not be found!" buttons {"OK"} default button 1 with icon 0 end tell exit repeat end if delay 5 end try end repeat </code></pre> <p><em><strong>EDIT</em></strong>: I have checked the above code using the TextEdit application and it works fine. To check it with your application run the following. Make sure the application is running when you run this code. If there's an error this will display it. If there's no error 2 dialogs will display showing the progress. Report what you find.</p> <pre><code>set processName to "WirelessUtilityCardbusPCI" try tell application "System Events" set theProcess to first process whose name is processName display dialog "I have found the process" set visible of theProcess to false display dialog "I just performed the \"set visible\" code" end tell on error theError number errorNumber tell me activate display dialog "There was an error: " &amp; (errorNumber as text) &amp; return &amp; return &amp; theError buttons {"OK"} default button 1 with icon stop return end tell end try </code></pre>
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    1. COWhat exactly "first" do? Your code is very interesting, but it doesn't work: it terminates without error dialog nor hiding the app. I think this process have some problem with "set visible", but this time it doesn't give me any error (unlike my previous attempts)!
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    2. COI added some code in the EDIT section above to help you find the issue. Try it and report back.
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    3. COI'm not sure why, but "set visible" isn't working for my app! The second dialog appears, but the application is still visible. And I have another problem: if I look for the process, sometimes my app run when the window is not drawed yet. This way the cmd+h keypress is performed on nothing and the script terminates without effect.
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