invokecommand.ps1

$LiveCred = Get-Credential

$Results = Invoke-Command -ComputerName ComputerA -ScriptBlock {
    [PSCustomObject]@{
        IP = Get-NetIPConfiguration |
            Where-Object { $_.IPv4DefaultGateway -and $_.NetAdapter.Status -ne "Disconnected" } |
            ForEach-Object {
                $_.IPv4Address.IPAddress
            }
        LastBoot = (Get-CimInstance -ClassName Win32_OperatingSystem).LastBootUpTime
} -Credential $LiveCred

$IP = $Results.IP
$LastBoot = $Results.LastBoot