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1.9.1 xhost +

Allows applications running on a remote machine and creating additional windows to appear on your workstation.

Examples
xhost + cranberry.cs.utk.edu
will allow applications running on cranberry.cs.utk.edu to appear on your workstation even if your workstation IS OUTSIDE of the cs.utk.edu (University of Tennessee Computer Science department) domain.
xhost + cranberry
will allow applications running on cranberry to appear on your workstation if your workstation IS INSIDE the same domain.
xhost +
will allow applications running on any computer to appear on your workstation.