A function that grabs all logon sessions from the script center

Get-LoggedOnUserSession.ps1

function Get-LoggedOnUserSession {
	#mjolinor 3/17/10
	[CmdletBinding()]
    param 
    (
        [Parameter(Position=0,
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true)]
        [string[]]$Name = $env:COMPUTERNAME)

	$regexa = '.+Domain="(.+)",Name="(.+)"$'
	$regexd = '.+LogonId="(\d+)"$'

	$logontype = @{
		"0"="Local System"
		"2"="Interactive" #(Local logon)
		"3"="Network" # (Remote logon)
		"4"="Batch" # (Scheduled task)
		"5"="Service" # (Service account logon)
		"7"="Unlock" #(Screen saver)
		"8"="NetworkCleartext" # (Cleartext network logon)
		"9"="NewCredentials" #(RunAs using alternate credentials)
		"10"="RemoteInteractive" #(RDP\TS\RemoteAssistance)
		"11"="CachedInteractive" #(Local w\cached credentials)
	}

	$logon_sessions = @(gwmi win32_logonsession -ComputerName $Name)
	$logon_users = @(gwmi win32_loggedonuser -ComputerName $Name)

	$session_user = @{}

	$logon_users |% {
		$_.antecedent -match $regexa > $nul
		$username = $matches[1] + "\" + $matches[2]
		$_.dependent -match $regexd > $nul
		$session = $matches[1]
		$session_user[$session] += $username
	}

	$logon_sessions |%{
		$starttime = [management.managementdatetimeconverter]::todatetime($_.starttime)
		$loggedonuser = New-Object -TypeName psobject
		$loggedonuser | Add-Member -MemberType NoteProperty -Name "Session" -Value $_.logonid
		$loggedonuser | Add-Member -MemberType NoteProperty -Name "User" -Value $session_user[$_.logonid]
		$loggedonuser | Add-Member -MemberType NoteProperty -Name "Type" -Value $logontype[$_.logontype.tostring()]
		$loggedonuser | Add-Member -MemberType NoteProperty -Name "Auth" -Value $_.authenticationpackage
		$loggedonuser | Add-Member -MemberType NoteProperty -Name "StartTime" -Value $starttime
		$loggedonuser
	}
}