# Virtual desktop templates Virtual desktop templates are the essential part of the Parallels RAS VDI. They are used to create hosts for publishing of desktops, applications, documents, etc. The guest OS support is the same as for RAS Guest Agent (which must be installed in a VM). See [**Software requirements**](/landing/ras-admin-guide/parallels-ras-21-administrators-guide/installing-parallels-ras/system-requirements/software-requirements.md). Hosts created from a Virtual desktop template normally serve a single user. They are managed entirely from within the RAS VDI, which includes such features as creating persistent VMs, managing VDI sessions, publishing resources from a specific Virtual desktop template, and others. --- # 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-admin-guide/parallels-ras-21-administrators-guide/virtual-desktop-infrastructure-vdi/manage-vdi/manage-templates-vdi/virtual-desktop-templates.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.