function Install-ORBAppServer {
<#
.SYNOPSIS
    Installs an ORB App Server.
#>

    [CmdletBinding()]
    Param(
        [Parameter(Mandatory = $false)]
        [Alias("SecretServerUserName")]
        [string]$secretUserName,

        [Parameter(Mandatory = $false)]
        [Alias("SecretServerPassword")]
        [string]$secretPassword,

        [Parameter(Mandatory = $false)]
        [Alias("SecretServerFolders")]
        [string]$secretFolderNames,

        [Parameter(Mandatory = $false)]
        [Alias("SecretServerDomain")]
        [string]$secretDomain = "corp.alkamitech.com",

        [Parameter(Mandatory = $false)]
        [Alias("SkipWarmup")]
        [switch]$skipAppWarmup,

        [Parameter(Mandatory = $false)]
        [Alias("PodGMSAAccount")]
        [string]$podGMSAAccountParent
    )

    if ( ( Test-IsAppServer ) -eq $false ) {
        $title = "You Are Attempting to Install the ORB App Tier on a Machine Identified as a non-App Tier Server";
        $message = "Do you want to quit?";

        $yes = New-Object System.Management.Automation.Host.ChoiceDescription "&Yes", "Breaks execution."
        $no = New-Object System.Management.Automation.Host.ChoiceDescription "&No", "Continues execution."
        $options = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no)
        $result = $host.ui.PromptForChoice($title, $message, $options, 0)

        if ( $result -eq 0 ) {
            Write-Host "Cancelling installation."
            return
        }
    }

    $logLead  = (Get-LogLeadName)

    Write-Output ("$logLead : Configuring Machine as App Tier Server for POD {0}" -f [Environment]::GetEnvironmentVariable("POD", "Machine"))

    if (![String]::IsNullOrEmpty($secretUserName) -and ![String]::IsNullOrEmpty($secretPassword) -and ![String]::IsNullOrEmpty($secretFolderNames) -and ![String]::IsNullOrEmpty($secretDomain)) {
        Read-AppTierSecrets $secretUserName $secretPassword $secretFolderNames $secretDomain
    }

    if (![String]::IsNullOrEmpty($podGMSAAccountParent)) {
        Set-AppTierGMSAAccounts $podGMSAAccountParent
    }

    if (($appTierApplications | Where-Object {$_.User.EndsWith("$") -and $_.IsGMSAAccount}).Count -gt 0 -or ((Get-AppTierServices) | Where-Object {$_.User.EndsWith("$") -and $_.IsGMSAAccount}).Count -gt 0) {
        Test-AppTierGMSAAccounts
    }

    Set-AppTierDefaultWebSite
    Set-AppTierFolderAndFilePermissions
    New-MachineConfigConnectionString $true
    New-MachineConfigConnectionString $false

    Write-Output "$logLead : Running the CreateSymLinks Script"
    New-OrbSymLinks

    Write-Output "$logLead : Creating AppPools, Services, Configs, etc"

    New-AppTierWebApplications
    New-AppTierWindowsServices
    New-AppTierHostFileEntries
    New-MachineConfigMachineKeys

    Rename-NewLogConfig
    Set-DefaultTLSVersion

    Write-Output "$logLead : Calling Disable-Nag"
    Disable-Nag

    Set-RapidFailSettings

    if ($skipAppWarmup) {
        return
    }

    Write-Output "$logLead : Warming up services..."
    Ping-AlkamiServices
}