Fedora 21
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SPICE Server
Install Desktop Virtualization "SPICE ( Simple Protocol for Independent Computing Environment )". It's possible to connect to virtual machines from remote client computer.
[1] Install SPICE Server if it's not installed yet. ( Normally it's already installed with KVM for dependency )
[root@dlp ~]#
yum -y install spice-server spice-protocol

[2] Edit existing virtual machine's xml-file and start virtual machine with SPICE like follows. This site's example has created a virtual machine without graphics, so it's OK to change settings like follows, but if you created virtual machine with a graphics, Remove "<graphics>***" and "<video>***" sections in xml file because qxl is used for graphics.
# edit the configration of "fedora21"

[root@dlp ~]#
virsh edit fedora21
<domain type='kvm'>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>
  <vcpu placement='static'>2</vcpu>
# add follows

# set any password for "passwd=***" section

# specify a uniq number for the section "slot='0x**'"

    <graphics type='spice' port='5930' autoport='no' listen='' passwd='password'>
      <listen type='address' address=''/>
    <sound model='ac97'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
      <model type='qxl' ram='65536' vram='32768' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>

Domain fedora21 XML configuration edited.

[root@dlp ~]#
virsh start fedora21
# start VM

Domain fedora21 started
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