function Get-SecurityGroupPrefix {
    <#
        .SYNOPSIS
        Easily return human-readable name for the Security Group in which a host belongs.
        .DESCRIPTION
        Query the host's Machine.config to determine the Security Group for a host and return in a format people can use.

        .PARAMETER ComputerName
        Optional Parameter. If specified, gets the Security Group for that server's pod, lane, designation, etc. Defaults to local computer.

        .EXAMPLE

        Get-SecurityGroup -ComputerName APP169671
    #>
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false)]
        [ValidateNotNullOrEmpty()]
        [string]$ComputerName="$env:computerName"
    )

    # get the FQDN no matter what for simplicity
    $ComputerName=[System.Net.Dns]::GetHostByName($ComputerName).HostName

    $securityGroup=Get-AppSetting -Key Environment.UserPrefix -ComputerName $ComputerName

    return $securityGroup
}