Get all machines that a user is logged onto

I had this question after viewing Get logged on user for multiple machines with Poweshell. Does anyone have a suggestion to modify this script or a suggestion for a different script that will search by username to find all machines where that user is logged on? This is the code that was in the previous article.

[CmdletBinding()]
Param(
	[Parameter(ValueFromPipeline=$True, Position=0)]
	[PSObject[]]$ComputerName = @($ENV:ComputerName)
)
Begin {
}
Process {
	$ComputerName |
		ForEach-Object {
			Try {
				If ($_ -is [Microsoft.ActiveDirectory.Management.ADComputer]) {
					$ServerName = $_.Name
				} Else {
					$ServerName = $_.ToString()
				}
				Get-WmiObject Win32_Process -Filter "Name='explorer.exe'" -ComputerName $ServerName -ErrorAction Stop |
					Select-Object -Property `
						@{Name="ServerName"; Expression={$_.PSComputerName}},
						@{Name="UserName"; Expression={$_.GetOwner() | % {"$($_.Domain)\$($_.User)"}}},
						@{Name="LogonDate"; Expression={$_.ConvertToDateTime($_.CreationDate)}},
						@{Name="SessionId"; Expression={[UInt32]$_.SessionId}},
						Exception |
					Group-Object -Property SessionId |
					ForEach-Object {
						$_.Group |
							Sort-Object -Property LogonDate |
							Select-Object -First 1
					}
			} Catch {
				$_ | Select-Object -Property `
					@{Name="ServerName"; Expression={$ServerName}},
					UserName,
					LogonDate,
					SessionId,
					@{Name="Exception"; Expression={$_.Exception.Message}}
			}
		}
}
End {
}

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