PS C:\Users\ststair> copy c:\windows\system32\cmd.exe
PS C:\Users\ststair> start .\cmd
PS C:\Users\ststair> copy c:\windows\system32\cmd.exe -erroraction SilentlyContinue
copy : The process cannot access the file 'C:\Users\ststair\cmd.exe' because it is being used by another process.
At line:1 char:1
+ copy c:\windows\system32\cmd.exe -erroraction SilentlyContinue
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Copy-Item], IOException
+ FullyQualifiedErrorId : System.IO.IOException,Microsoft.PowerShell.Commands.CopyItemCommand