How must I set the DISPLAY variable in order to be able to open x-windows applications?

[Schawe, Dirk]

I have just installed cygwin/X and got the error message "Can't open
display:" when starting e.g. xterm, xfig, ddd, i.e. an x-window
application.

I tried to set DISPLAY=localhost:0.0 or DISPLAY="IP-Address":0.0 with
export DISPLAY, but the error message remained.

How must I set the DISPLAY variable in order to be able to open
x-windows applications?

Thank you very much.

Sincerely yours,
Dirk SCHAWE

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