The information in this knowledge base item relates only to the obsolete TatukGIS Internet Server (IS) product which was discontinued in January 2014 and replaced by the TatukGIS Developer Kernel ASP.NET edition (which is licensed per developer, and not per server). For more information, refer to the TatukGIS News article dated January 29, 2014 and to the DK for ASP.NET product description page.
For anyone who may still be using the obsolete Internet Server product:
The TatukGIS Internet Server product is licensed by server/computer, not by developed application and not by developer. So it is allowed to run two IS applications on a single server under one IS license. And it allowed for two developers to access and work with the IS product under a single license, provided that the IS is installed only on the one server computer.
Because the IS product is licensed by server, using a second copy of the same IS application on a complimentary or back-up server requires purchase of a separate IS license for each additional server computer.