function Generate-ZabbixAgentHostname { 

    $w32cs = Get-CimInstance 'Win32_ComputerSystem'
    $w32os = Get-CimInstance 'Win32_OperatingSystem'

    # generate unique identifier for Zabbix Server
    '__{0}-__{1}__-{2}' -f $w32cs.Domain, $w32cs.Name, $w32os.SerialNumber
        
    } # end function Generate-Hostname