Processing power and RAM are the most important resources.

Since an RD Session Host server will be serving applications or full desktops to clients, you'll need to purchase or build a powerful server. RDS servers are designed on a similar principle - if most of the processing takes place in a single location, you can concentrate the hardware resources needed to support that processing in a single location and worry less about power on the client end. That's all a file server is: a computer running a big, fast hard disk so that you don't have to buy big, fast hard disks for everyone in the office. The notion of using a bigger server so that you can skimp on client-side hardware isn't new. Because the server will be supporting dozens of people - maybe hundreds - this is not the time to skimp on power. The computing model for thin-client networking means that the horsepower is concentrated on the server end, not the client end. Find out all of the new Windows Server 2008 R2 technologies and learn how to use undocumented features. This book provides Windows Server 2008 R2 information that is relevant to solutions providers, including coverage on Active Directory, Remote Desktop Services and advice on managing user accounts. This chapter excerpt on Installing, Using, and Administering Remote Desktop Services (download PDF) is taken from the book Mastering Microsoft Windows Server 2008 R2.

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