Changeing preferences on network printer queue with Powershell

Hi,

I found a script on this page - http://gallery.technet.microsoft.com/scriptcenter/878e6bac-e2a1-4502-9333-5b1420f8b957 - that I am trying to adapt to work on my users computers and not only on servers. But I can't seem to figure out how to get a reference to the network attached printers and change their preferences on the computer, the script only get the local ones.

The goal is to use only a portion of the script as a logon script for some users that need onesided printing as default.

param ($ChangeProp) 
$host.Runspace.ThreadOptions = "ReuseThread" 
Add-Type -AssemblyName System.Printing 
$permissions = [System.Printing.PrintSystemDesiredAccess]::AdministrateServer 
$queueperms = [System.Printing.PrintSystemDesiredAccess]::AdministratePrinter 
$server = new-object System.Printing.PrintServer -argumentList $permissions 
$queues = $server.GetPrintQueues() 
function SetProp($capability, $property, $enumeration) 
    { 
        if ($PrintCaps.$capability.Contains($property))  
                            {         
                              $q2.DefaultPrintTicket.$enumeration = $property         
                              $q2.commit() 
                                write-host ($q.Name +" is now configured for " + $property) 
                                write-host (" ")     
                             } 
                        else  
                            {  
                                write-host ($q.Name +" does not support " + $property) 
                                write-host (" ") 
                            } 
    } 
try { 
 foreach ($q in $queues)  
        {  
            #Get edit Permissions on the Queue 
            $q2 = new-object System.Printing.PrintQueue -argumentList $server,$q.Name,1,$queueperms 
            # Get Capabilities Object for the Print Queue 
            $PrintCaps = $q2.GetPrintCapabilities() 
            switch ($ChangeProp) 
             { 
                {$_ -eq "twosided"}  
                    {  
                       SetProp DuplexingCapability TwoSidedLongEdge Duplexing 
                       break 
                    } 
                    {$_ -eq "onesided"}  
                    {  
                       SetProp DuplexingCapability onesided Duplexing 
                       break 
                    } 
                    {$_ -eq "mono"}  
                    {  
                        SetProp OutputColorCapability monochrome OutputColor  
                        break 
                      } 
                {$_ -eq "color"}  
                    {  
                        SetProp OutputColorCapability color OutputColor  
                        break 
                      } 
                {$_ -eq "staple"}  
                    {  
                        SetProp StaplingCapability StapleTopLeft Stapling  
                        break 
                      } 
                {$_ -eq "show"}  
                    {  
                        $DefaultTicket = $q2.DefaultPrintTicket 
                        $TicketProps = $DefaultTicket | Get-Member -MemberType Property 
                        write-host (" ") 
                        write-host ($q.name) 
                        foreach ($p in $TicketProps) 
                        { 
                         $PName = $p.name 
                         $PropValue = $DefaultTicket.$PName 
                         write-host ($p.name + " = " + $PropValue) 
                        } 
                      } 
                default 
                    { 
                        Write-Host ("$_ is not a valid parameter") 
                        exit 
                    } 
                } 
        } 
    } 
catch [System.Management.Automation.RuntimeException] 
 { 
    write-host ("Exception: " + $_.Exception.GetType().FullName) 
    write-host $_.Exception.Message 
 }