I'm trying to run tclsh with tk and I get a display error:

```
no display name and no $DISPLAY environment variable

```

Then I try the following:

```
export DISPLAY=:0.0

```

And of course it says it couldn't connect to display ":0.0".

The Cygwin/X server has been installed strictly according to <http://x.cygwin.com/>. But it is documented nowhere how to start this Cygwin/X server. So I assume Cygwin/X server is started when Cygwin is started.

What do I need to do to make this work?