Get-RdpConfiguration.ps1

<#
.DESCRIPTION
Get Remote Desktop Server configuration
#>

$reg = Get-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp\'

[pscustomobject] @{
    ListenPort = $reg.GetValue("PortNumber")
    AvailableUsers = @(
        (Get-LocalGroupMember "Administrators").Name,
        (Get-LocalGroupMember "Remote Desktop Users").Name
    )
}