In the screen shot above, you can see the newly created directory on the appxODBC server. I named my new appxODBC gateway localhost, and the mdcreate tool created a directory on the appxODBC server named localhost.dbs. Inside the directory localhost.dbs you can see a configuration file named appx.env. This appx.env file contains a string "APPX_DATA_SERVER=localhost:8060". This string tells the appxODBC server that listens on TCP port 1990 to connect to the APPX Server on localhost at TCP port 8060.