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I had a script to query unused desktops. The full code got left behind at a client but the relevant part was something like this:

$date = (Get-Date).AddDays(-180)
$machines = Get-BrokerMachine -MaxRecordCount 20000 -Filter { LastConnectionTime -le $date }
$machines |  Export-Csv $outfile

You might be able to do something similar with

Get-BrokerApplication

Thanks I will give it a go, you would think Citrix would have that in Monitor already.