Windows XP PRO - windows terminal services

Can i Install windows termincal services (with 3-4 licenses) on a Windows XP machine or it can be installed only on Windows 2000/2003/2005 server ?
I need to be able to run a .net program from my PDA using terminal client through WIFI and i'm positive that is the easiest way to implement it. The problem is that i can not install it on a windows server operating system since is too expensive and all my clients have at least one Windows XP Pro machine. Let me know if you have any other ideas.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Pro only supports and is licensed for ONE connection (Remote Desktop) at a time and when that connection is in use, the PC itself cannot be used for anything else.  
Try a free 14 day trial of (maybe on a virtual machine or spare machine), this allows XP to act as a terminal server, the price is very reasonable, otherwise by default as mentioned pro only supports one active session and XP locks out the console when being used remotely.

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there are lots of products that let you use an xp machine as a term server. Legally, you still need to buy ts cals of course. You could run anVMWare ESXi server, then put up 4 xp pro machines (one rdp connection to each of them).
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