Hallo Ray
Interakt, who developed the product initially, have a very good documentation about all the features of "ADDT includes" (formerly Interakt MX Includes):
mx_kollection.htm
Interakt (ADDT) had three different server behaviors for Server-Side Includes:
1. Regular "Server-Side Include", defines one file to be included. I usually use this for headers or footers: 049a10_serversideinclude.htm
2. "Server-Side Include from List", the most important feature (for me):
049a30_ssifromlist.htm
3. "Server-Side Include from table":
049a20_ssifromtable.htm
Please check the "New Features" area --> "MX Includes features". There you can also check the features of "NeXTensio", which was mentioned recently in other threads, asking for reorderable lists:
045320_nxtlistbrowserbehavior.htm
045310_nextensio_list_wz.htm#step4