# Introduction This guide is intended for system administrators deploying and managing Parallels® Remote Application Server (RAS) in their organizations. It begins with the introduction to Parallels RAS and its key components and then outlines the basic principles of how these components operate. The main topics of this guide describe various Parallels RAS deployment scenarios, complete with diagrams and other information. The guide concludes with the information about communication ports used by Parallels RAS and the information about using SSL certificates. --- # 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-reference-architecture/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.