Thanks for the information! I see why this step is needed previously. Now I 
am able to continue and MIT-SHM does appear in the xdpyinfo output.

For the next part, connecting to the VirtualGL server, I tried to use the 
command:

/opt/VirtualGL/bin/vglconnect *user*@*server*


but vglconnect does not exist in that location. There's no /opt directory 
to start with. I'm only able to find vglconnect in 
./cygdrive/c/Users/username/AppData/Local/Packages/MirrorName/LocalState/rootfs/opt/VirtualGL/bin/.
 
Also running it gives me 

./vglconnect: line 111: ./vglclient: cannot execute binary file: Exec 
> format error
> [VGL] ERROR: vglclient failed to execute.


Did I install it wrong or is it something else? Thanks in advance!



Here is the output when I ran vglcygsetup script:

> $ ./vglcygsetup 
> Fetching setup.ini ...
> Fetching x86_64/VirtualGL-2.3.3-20131014.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.3.90-20140717.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.4-20150126.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.4.1-20150612.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.4.90-20151027.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.5-20160215.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.5.1-20161001.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.5.2-20170302.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.5.90-20180425.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.6-20180824.tar.bz2 ...
> Fetching x86_64/VirtualGL-2.6.1-20190101.tar.bz2 ...
> Fetching Cygwin setup ...
> Launching Cygwin setup ...
> note: Hand installation over to elevated child process.

and I followed the setup window to install VirtualGL. 



On Thursday, April 18, 2019 at 8:08:07 AM UTC-7, DRC wrote:
>
> The CYGWIN environment variable is used to tweak the behavior of 
> Cygwin's Unix emulation layer.  It has nothing to do with the PATH. 
> However, according to the documentation 
> (https://cygwin.com/cygwin-ug-net/using-cygwinenv.html), setting 
> CYGWIN=server is apparently no longer necessary.  It was necessary at 
> one time in order to fully enable shared memory emulation. 
>
> On 4/18/19 2:17 AM, marcus wrote: 
> > Hi, 
> > 
> > I'm new to VirtualGL and encounter a problem when configuring the 
> > windows client. In ver 2.6.1 doc, there is a step that I got stuck: 
> > 
> >     5. Add |server| to the |CYGWIN| system environment variable (create 
> >     this environment variable if it doesn’t already exist) 
> > 
> > 
> >  I'm not very familiar with cygwin so I'm wondering what the 'server' 
> > path is in this scenario. (I believe 'CYGWIN' variable refers to PATH 
> > and i could add it through 'export PATH=$PATH:/path/to/server') 
> > 
> > Thank you! 
>

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