Thin client: Windows Fundamentals for Legacy PCs Main article: Windows Fundamentals for Legacy PCs In July 2006, Microsoft released a thin client version of Windows XP Service Pack 2, called Windows Fundamentals for Legacy PCs (WinFLP). It is only available to Software Assurance customers. The aim of WinFLP is to give companies a viable option for updating older computers running Windows 95, 98, and that I will support with patches and updates for the coming years. Most user applications typically run on a remote computer using Terminal Services or Citrix.