On the target box, you need to do xhost +serverbox
Although on most recent distributions of X, TCP access is disabled by 
default, so you either have to restart X and make sure it is listening 
to TCP connections, or tunnel everything through ssh then you need not 
worry about DISPLAYs and xhost and such.

~J

Ryan O'Rourke wrote:
> I'm trying to run a RealPlayer-based application on a remote host from
> PuTTY in Windows. It's an application that will capture Real audio as
> it plays through RealPlayer so it needs to actually open the
> application to do it. I don't see a way for RealPlayer to run without
> X so I'm trying to set the $DISPLAY variable to open RealPlayer on my
> Linux host. There must be something wrong though because if I do:
>     DISPLAY=hostname:0 realcap [arguments] [options] [URL] &
> I get an error message about not being able to open the display.
> 
> What do I need to do in order for my command to open RealPlayer on the
> remote Linux box instead of trying to open it on my local Windows box?
> 
> TIA.
> 
> -- Ryan
> 
> 
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