• declared on Line 57
• used on 
  • Line 341
    • This line creates a HostInfo object, which is defined here
    • This object is referred to frequently throughout the source code
      • Most of these usages are either contributions to the construction of the EditorServicesConfig object or references to one
        • These references are usually intances of HostStartupInfo, which also gets declared as "hostInfo"
          • These HostStartupInfo and EditorServicesConfig objects hold a lot of data, including data on some of the bootstrapper's parameters. This includes a couple of default values
        • Others are used for "Verbose" logging
  • Line 393
    • Part of function block for GetProfilePathFromProfileObject
    • Is combined with the root folder of pwshProfilePath on Line 391
      • this guy is declared on Line 384
        • references profileObject and profilePathName
          • profileObject
            • set as profile on Lines 362-365
              • profile set on Line 339

So HostProfileId is a filename prefix used to reference a custom powershell profile that exists in the same directory as the current powershell profile

This is the PowerShell equivalent of Line 393:

function GetProfilePathFromProfileObject( $profile, $user, $host ){
  $profilePath = $profile."$user$host"
  Join-Path -Path (Split-Path $profilePath) -ChildPath "$($HostProfileId)_profile.ps1"
}

We need to test this functionality