Vmware Citrix Xenn virtualization on dedicated server

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http://www.unix.com – hi, I am newbie and I think I am trying to bit off more than I could chew in this field. I would like to know if virtualization with Vmware Citrix on a dedicated server under ubuntu 64bit is simple. I looked up in the board with keyword "virtualization, vmware, dedicated" but replied threads are not much. Can anybody suggest me where to start from scratching this issue? Can it be done by only system/network administator? Thanks in advance Baris35 (HowTos)