Function Set-ComputerName
{
    [CmdletBinding(SupportsShouldProcess=$true)]
    param
    (
        [parameter(Mandatory=$true, Position=0,
            HelpMessage="Letter abbrevation for company e.g JMC, IBM, SCO. This can be anything!")]
        [ValidateScript({
            # Must be 1-3 letters or numbers
            $_ -match '^([a-z]|[A-Z]|[0-9]){1,3}$'
        })]
        [string] $CompanyLetters,

        [switch] $AllUppercase,

        [switch] $Restart,

        [switch] $Force
    )

    #This Function will change the hostname to the following format: JMC-LT-12345ABC or JMC-PC-12345ABC for a unique standard.

    $SerialNumber = Get-CimInstance -ClassName Win32_BIOS | Select-Object -ExpandProperty SerialNumber

    # Checks if Chassis type is: Laptop(9) Notebook(10) Sub Notebook(14)
    if (Get-CimInstance -ClassName win32_SystemEnclosure |
            Where-Object { $_.chassistypes -eq 9 -or $_.chassistypes -eq 10 `
                -or $_.chassistypes -eq 14})
    {
        $newName = $CompanyLetters + "-LT-" + $SerialNumber
    }
    else
    {
        $newName = $CompanyLetters + "-PC-" + $SerialNumber
    }

    if ($PSBoundParameters.ContainsKey("AllUppercase"))
    {
        $newName = $newName.ToUpper()
    }

    if ($newName.Length -gt 15)
    {
        throw "$newName is greater than 15 characters and therfore an invalid NetBIOS name."
    }
    elseif ($Force -or $PSCmdlet.ShouldContinue($newName, "Rename local machine to:"))
    {
        $rnArgs = @{
             NewName = $newName
             Confirm = $false
             Force = $null
        }
        if ($PSBoundParameters.ContainsKey("Restart"))
        {
            $rnArgs.Restart = $null
        }
        Rename-Computer @rnArgs
    }
}