# Introduction Parallels® Remote Application Server (Parallels RAS) is an application delivery and virtual desktop solution. It extends Microsoft Windows Remote Desktop Services by providing centralized and simplified management, universal printing, and highly available load balanced remote access solution to Windows Terminal Services based applications and desktops from any device, anywhere. Traditionally, application delivery and VDI solutions were challenging to set up and manage. Design and implementation could take weeks or even months to complete. In contrast, Parallels RAS can be installed in days or even hours, providing a quicker return on your investment and an easier path to realizing the benefits of remote desktop computing. This guide is intended for system administrators responsible for installing and configuring Parallels RAS. The guide assumes that the reader is familiar with such Microsoft services as Active Directory, DNS, DHCP, Terminal Servers/Remote Desktop Session Hosts and has an intermediate networking knowledge. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.parallels.com/landing/ras-best-practices-guide/v20/introduction.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.