host--the name of a valid system on the network.
display--the number of the display on the host.
screen--Optional. The screen within the display. The default is 0.
You can find these values by typing env, and examining the DISPLAY line. The terminal emulator is running on your system, but the window shows on another system.
For example, the following command starts a dtterm window on the host computer named hpcvxdm:
dtterm -display hpcvxdm:0 &