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PowerShell script to ensure only one instance of MEP is running

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I had a problem with a server where multiple administrators would try to log in resulting in multiple instance of MEP crashing into each other to do administrative tasks. I started to write a start-up macro that would conditionally abort launch if an instance was already running but MEP cannot 'see' processes running under other users. Since PowerShell can see processes for all users I wrote this little script that will launch MEP only if it's not already running regardless of user. Thought I'd post it here in case anyone might benefit from it.

if (-Not (Get-Process "MacExp" -ErrorAction SilentlyContinue | Where-Object {-not $_.HasExited }))
  & "C:\Program Files (x86)\Macro Express Pro\MacExp.exe"

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