Item explanatory text via .ts

Another of the allowable items in a put command is the explanatory text associated with a named item (a set, file, acronym, parameter, variable, model or equation).  These are addressed using the syntax itemname.ts.  An example of such addressing occurs in the putex1.gms example as follows:

put 'Run over scenario set ' scenarios.ts //;

where the resultant put file contains

Run over scenario set Four alternatives