http://powershell.org/wp/forums/topic/need-help-with-my-script-2/

powershellorg-forum-post-29436-reply2.ps1

$Desktops = get-content c:\temp\desktoplist.txt

foreach ($Desktop in $Desktops) {
    switch -wildcard ($Desktop) {
        'UK*'{$servers = @('UKSite1.com', 'UKSite2.com')}
        'US*'{$servers = @('USSite1.com')}
        'SG*'{$servers = @('SGSite1.com')}
    }

    $DesktopDetail = foreach ($server in $servers) {
        Get-BrokerDesktop -machinename domain\$Desktop -Adminaddress $server |
            Select-Object -Property DNSName, SessionState
    }

    if ($DesktopDetail) {
        $DesktopDetail
    }
    else {
        'No machine with name {0} found on server(s): {1}' -f $Desktop, ($Servers -join ',')
    }
}