Configuring Citrix MetaFrame for Windows 2000 Terminal Services

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SpeedScreen2 is a MetaFrame feature of the ICA protocol that offers considerable speed advantages over other thin-client protocols. SpeedScreen2 cuts the average packet size by 25-30 percent and can reduce total transmissions by up to 60 percent! SpeedScreen2 can improve performance over a low-speed dial up, but at up to four times the normal transmission rate. SpeedScreen2 requires no special installation and is automatically a part of the ICA technology.

The ICA Browser

Each MetaFrame server runs an ICA Browser service in addition to its other presentation duties. This service communicates status information to a central repository server known as the ICA master browser. The master browser is responsible for keeping track of the status information for each Citrix member server and maintaining the connection information for each protocol. Master browsers are elected based on certain characteristics such as operating system type, server role, etc. There may be separate master browsers for each protocol that is enabled, or a single master browser can handle multiple protocols. If a Citrix server is not the master browser, it is known as a member browser.

Each subnet requires a separate master browser. The ICA master browser election is conducted through broadcast messages that typically are not allowed to cross routers. A master browser election is initiated when a MetaFrame server is started, the current master browser stops responding to member server requests, the current master browser doesn’t respond to ICA client requests, or multiple master browsers are detected for the same protocol. The election process will take the following into consideration in an order of precedence, highest to lowest:

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