Summary
----
PowerShell cmdlets to check WindowsUpdate and return patch list.

This script is intended for offline Windows patching.
(MBSA 2.2 currently not support Windows 8/Windows Server 2012)

Usage
---
following sample check WindowsUpdate for specified computer,
and download files to network share.

``` powershell
$target = $env:COMPUTERNAME
#$filter = "IsAssigned=1 and IsHidden=0"
$filter = "IsHidden=0"

#Get WindowsUpdate file list for target computer(if not domain environment -Credential parameter needed)
$results = Invoke-Command -Computer $target -ScriptBlock ${function:Get-WindowsUpdateFileList} -ArgumentList $filter

#Download files
$destination= "\\172.16.0.1\Shared\Images\WindowsUpdate\WindowsServer2012"
foreach($update in $results)
{
    $params = @{
        Source      = $update.DownloadURL
        DisplayName = $update.Title
        Description = $update.DownloadURL
        Destination = $destination
    }
    Start-BitsTransfer @params
}
```