function Get-DellWarranty {
    <#
    .Synopsis
        Provides warranty information for one or more Dell service tags.
    .Description
        Queries the Dell Website for a list of service tags and returns the warranty information as a custom object.
        If a service tag has multiple warranties, they are returned as multiple separate objects.
        If no service tag is specified, it will attempt to retrieve and lookup the local system's service tag.
        
        The service tag can be provided to the command in several ways: 
        1. Using the -servicetag parameter
        2. By passing one or more Service Tags via the pipeline
        3. By passing objects that have either servicetag or serialnumber defined as a property, such as win32_bios WMI objects
         
        See examples for details.
    .Parameter ServiceTag
        ALIAS: serialnumber
        The Dell service tag you wish to query. Example: XYZ12A3
    .Example
        C:\PS> Get-DellWarranty
        
        Service Tag                 : XXXX123
        Description                 : 4 Hour On-Site Service
        Provider                    : UNY
        Warranty Extension Notice * : No
        Start Date                  : 6/19/2009
        End Date                    : 6/20/2011
        Days Left                   : 140
        
        Description
        -----------
        If no service tags are provided, the script retrieves the local computer's serial number from WMI and queries for it.
    .Example
        C:\PS> Get-DellWarranty -ServiceTag XXXX123
        
        Service Tag                 : XXXX123
        Description                 : 4 Hour On-Site Service
        Provider                    : UNY
        Warranty Extension Notice * : No
        Start Date                  : 6/19/2009
        End Date                    : 6/20/2011
        Days Left                   : 140
        
        Description
        -----------
        You can pass the service tag as a parameter, or as the first positional parameter (e.g. Get-DellWarranty XXXX123)
    
    .Example
        C:\PS> "XXXX123","XXXX124","XXXX125" | get-dellwarranty
        Service Tag                 : XXXX123
        Description                 : 4 Hour On-Site Service
        Provider                    : UNY
        Warranty Extension Notice * : No
        Start Date                  : 6/19/2009
        End Date                    : 6/20/2011
        Days Left                   : 140
        
        Service Tag                 : XXXX124
        Description                 : 4 Hour On-Site Service
        Provider                    : UNY
        Warranty Extension Notice * : No
        Start Date                  : 6/14/2009
        End Date                    : 6/15/2011
        Days Left                   : 145
        
        Service Tag                 : XXXX125
        Description                 : NBD On-Site Service
        Provider                    : DELL
        Warranty Extension Notice * : No
        Start Date                  : 6/14/2008
        End Date                    : 6/15/2010
        Days Left                   : 0
        
        Description
        -----------
        You can pass serial numbers via the pipeline either directly or as a variable.
        
    .Example
        C:\PS> get-wmiobject win32_bios -computername "computer1","computer2","1.2.3.4" | get-dellwarranty
        Service Tag                 : XXXX123
        Description                 : 4 Hour On-Site Service
        Provider                    : UNY
        Warranty Extension Notice * : No
        Start Date                  : 6/19/2009
        End Date                    : 6/20/2011
        Days Left                   : 140
        
        Service Tag                 : XXXX124
        Description                 : 4 Hour On-Site Service
        Provider                    : UNY
        Warranty Extension Notice * : No
        Start Date                  : 6/14/2009
        End Date                    : 6/15/2011
        Days Left                   : 145
        
        Service Tag                 : XXXX125
        Description                 : NBD On-Site Service
        Provider                    : DELL
        Warranty Extension Notice * : No
        Start Date                  : 6/14/2008
        End Date                    : 6/15/2010
        Days Left                   : 0
        
        Description
        -----------
        You can also pass any object that has a "serialnumber" or "servicetag" property. In this example, we query computers directly for their serial numbers,
        and pass those results (which are WMI objects that have a serialnumber property) via pipeline directly to the command to obtain warranty information.
    
    .Notes
        AUTHOR:     Justin Grote <jgrote NOSPAM-AT allieddigital NOSPAM-DOT net>
        WARNING:    Since Dell does not provide a formal API, this script works by screen-scraping the HTML from the Dell product support site. 
                    Any future change to the layout or logic of this site will break the script or cause unpredictable results.
        
        HISTORY:    v1.0 [31 Jan 2011] - Initial Module Creatio
    .Link
        http://support.dell.com/support/topics/global.aspx/support/my_systems_info

    #>


    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$False,Position=0,ValueFromPipeline=$True,ValueFromPipelineByPropertyName=$True)]
        [alias("serialnumber")]
        [string[]]$ServiceTag
    )

    PROCESS {
    
        # If nothing was passed, retrieve the local system service tag
        if ($ServiceTag -eq $null) {
            write-verbose "No Service Tags provided. Using Local Computer's Service Tag"
            write-verbose "START Obtaining Serial number via WMI for localhost"
            $ServiceTag = (get-wmiobject win32_bios).SerialNumber
            write-verbose "SUCCESS Obtaining Serial number via WMI for localhost - $ServiceTag"
        }
        
        # Detect if an array of service tags were passed via parameter and unwind them.
        foreach ($strServicetag in $servicetag) {
                write-verbose "START Querying Dell for Service Tag $_"
                Get-DellWarrantyWorker $strServicetag
                write-verbose "SUCCESS Querying Dell for Service Tag $_"
        }
    }

}

Function Get-DellWarrantyWorker {
  Param(
    [String]$serviceTag
  )
  #Dell Warranty URL Path
  $URL = "http://support.dell.com/support/topics/global.aspx/support/my_systems_info/details?c=us&l=en&s=gen&ServiceTag=$serviceTag"
  
  trap [System.FormatException] { 
    write-error -category invalidresult "The service tag $serviceTag was not found. This is either because you entered the tag incorrectly, it is not present in Dell's database, or Dell changed the format of their website causing this search to fail." -recommendedaction "Please check that you entered the service tag correctly"
    return;
  }
  
  #Screenscrape the HTML for the warranty Table
  $HTML = (New-Object Net.WebClient).DownloadString($URL)
  If ($HTML -Match '<table[\w\s\d"=%]*contract_table">.+?</table>') {
    $htmltable = $Matches[0]
  } else {
    throw (New-Object System.FormatException)
  }
  $HtmlLines = $htmltable -Split "<tr" | Where-Object { $_ -Match '<td' }
  $Header = ($HtmlLines[0] -Split '<td') -Replace '[\w\s\d"=%:;\-]*>|</.*' | Where-Object { $_ -ne '' }
  
  #Convert the warranty table fields into a powershell object
  For ($i = 1; $i -lt $HtmlLines.Count; $i++) {
    $Output = New-Object PSObject
    $Output | Add-Member NoteProperty "Service Tag" -value $serviceTag
    $Values = ($HtmlLines[$i] -Split '<td') -Replace '[\w\s\d"=%:;\-]*>|</.*|<a.+?>'
    For ($j = 1; $j -lt $Values.Count; $j++) {
      $Output | Add-Member NoteProperty $Header[$j - 1] -Value $Values[$j]
    }
    
    #Minor formatting fix if days remaining on warranty is zero
    if ($output.'Days Left' -match '<<0') {write-host -fore darkgreen "match!";$output.'Days Left' = 0}
    
    return $Output
  }
}