I have made good progress today, thanks to the help of this list.  Thanks!

I can now run the example on the First Document <http://wiki.contextgarden.net/First_Document> web page, running ConTeXt from the command line.  That works perfectly.

When I try to run the same file from within TeXShop, however, it tells me:

> !  Undefined control sequence.
> l.2  \startsection
> 		[title={Testing ConTeXt}]
> ?

I have created the file "ConTeXt Suite.engine" in directory ~/Library/TeXShop/Engines, per the instructions on the Mac Installation <http://wiki.contextgarden.net/Mac_Installation> web page.

So I am not sure why TeXShop does not know about \startsection.  I would be grateful for your advice on this.

Sincerely,
Bruce


> On Dec 15, 2015, at 12:17 PM, Boghosian, Bruce <bruce.boghosian@tufts.edu> wrote:
> 
> Dear Mojca:
> 
>> On Dec 15, 2015, at 10:20 AM, Mojca Miklavec <mojca.miklavec.lists@gmail.com <mailto:mojca.miklavec.lists@gmail.com>> wrote:
>> 
>> [...]
>> 
>> ... oh, and I just noticed one more thing that might be causing the
>> problem. You also need to remove the TEXMF variable.
> 
> That fixed it!!!
> 
> Thanks very much to everybody for all the informative help and advice.
> 
> Best regards,
> Bruce
> 
> Bruce M. Boghosian
> Professor, Department of Mathematics, Tufts University
> Bromfield-Pearson Hall, Medford, Massachusetts 02155, USA
>