## Terms and Abbreviations Used in This Guide
Term/Abbreviation | Description
RAS Console | Parallels RAS Console. The RAS console is the primary interface you use to configure, manage, and run Parallels RAS. As an administrator, you use the RAS console to manage Farms, Sites, RD Session Hosts, published resources, client connections, etc.
Category | In the RAS console, categories are displayed in the left pane of the main window. Each category consists of a number of settings related to a specific task or operation. The categories include Start, Farm, Load Balancing, Publishing, Universal Printing, Universal Scanning, Connection, Client Manager, and others.
Farm | A Parallels RAS Farm is a logical grouping of objects for the purpose of centralized management. A Farm configuration is stored in a single database which contains information about all objects comprising the Farm. A Farm consists of at least one Site but may have as many sites as necessary (see Site below).
Site | A Site consists of at least one RAS Publishing Agent, RAS Secure Client Gateway (or multiple gateways), and RAS agents installed on RD Session Hosts, VDI providers, and Windows PCs. Note that a given RD Session Host, VDI provider, or PC can be a member of only one Site at any given time.
Licensing Site | The Site that manages Parallels RAS licenses in a Parallels RAS Farm. By default, the server on which you install Parallels RAS becomes the Licensing Site. If you create additional sites later, you can designate any one of them as the Licensing Site. There can be only one Licensing Site in a given Farm. All other sites are called secondary sites. Note: Parallels RAS updates or upgrades must be applied to the Licensing Site first.
RAS Secure Client Gateway | RAS Secure Client Gateway tunnels all traffic needed by applications on a single port and provides secure connections.
HTML5 Client | HTML5 client allows users to view and launch remote applications and desktops in a web browser. The HTML5 client functionality is a part of RAS Secure Client Gateway.
Publishing | The act of making items installed on a Remote Desktop Server, VDI provider or Remote PC available to the users via Parallels RAS.
RAS Publishing Agent | RAS Publishing Agent provides load balancing of published applications and desktops.
RAS RD Session Host Agent | RAS RD Session Host Agent collects information from Microsoft RDS hosts required by the Publishing Agent and transmits to it when required.
Remote PC Agent | Remote PC Agent collects information from Remote PC hosts required by the Publishing Agent and transmits to it when required.
RAS Guest Agent | RAS Guest Agent collects information from the VDI desktop required by RAS Publishing Agent and transmits to it when required.
RAS VDI Agent / RAS Provider Agent | RAS VDI Agent collects information from the Parallels RAS Infrastructure and is responsible for controlling VDI through its native API. RAS VDI Agent is built into the RAS Publishing Agent and is available by default. It can be used to control multiple VDI providers in a Parallels RAS Farm. RAS Provider Agent is the same as RAS VDI Agent, but the term is used in the context of Windows Virtual Desktop (described at the end of this table).
RAS VDI Agent dedicated | RAS VDI Agent dedicated is similar to the RAS VDI Agent described above with one important difference — it is a separate component that must be installed from the Parallels RAS installer and can only control a single VDI provider.
RDSH or RD Session Host | RDSH makes applications and a full desktop accessible to a remote client that supports Remote Desktop Protocol (RDP). RDSH replaced Terminal Servicer beginning with Windows 2008 R2.
HALB | High Availability Load Balancing (HALB) is an appliance that provides load balancing for RAS Secure Client Gateways. Parallels HALB virtual appliance is available for the following hypervisors: Hyper-V, VMware. Multiple HALB Virtual Servers representing different HALB devices can be deployed in a single Site. Multiple HALB deployments can run simultaneously, one acting as the primary and others as secondaries. The more HALB deployments a Site has, the lower the probability that end users will experience downtime. Primary and secondary HALB deployments share a common or virtual IP address (VIP). Should the primary HALB deployment fail, a secondary is promoted to primary and takes its place.
Tenant Broker | Tenant Broker is a special RAS installation that hosts shared RAS Secure Client Gateways. It is an essential part of the RAS multi-tenant architecture.
Tenant | Tenants are RAS farms that join Tenant Broker (see above) and use shared RAS Secure Client Gateways and HALB thus eliminating the need to have their own Gateways and HALB deployed.
RAS Enrollment Server | RAS Enrollment Server is an essential component of the SAML SSO Authentication functionality. It communicates with Microsoft Certificate Authority (CA) to request, enroll, and manage digital certificates on behalf of the user for SSO authentication in the Parallels RAS environment.
RAS PowerShell | Parallels RAS PowerShell allows you to perform Parallels RAS administrative tasks using PowerShell cmdlets. You can execute cmdlets in the Windows PowerShell console or you can write scripts to perform common Parallels RAS administrative tasks. A complete guide to Parallels RAS PowerShell is available on the Parallels website together with other Parallels RAS documentation.
RAS REST API | Parallels RAS comes with various APIs to help you develop custom applications that integrate with it. The RAS REST API is one of them.
RAS Management Portal | Parallels RAS Management Portal is an HTML5 browser-based application that lets you manage Parallels RAS.
RAS Web Administration Service | A Web service that provides the user interface for RAS Management Portal and implements RESTful Web services for the RAS REST API (see above).
Windows Virtual Desktop | Microsoft Windows Virtual Desktop is a desktop and app virtualization service running on Microsoft Azure, providing access to RD Session Hosts and VDI. Parallels RAS 18 provides the ability to integrate, configure, maintain, support and access Windows Virtual Desktop workloads on top of the existing technical capabilities of Parallels RAS.
FSLogix | FSLogix Profile Container is a remote profile solution for non-persistent environments. Parallels RAS supports FSLogix on RD Session Hosts, VDI, and Windows Virtual Desktop.