Execution time set writes

When loading sets it is often desirable to use $Call and allows domain definitions.  This is hardly ever desirable when unloading or writing to a spreadsheet.  In such case one uses the Execute syntax as follows (Gdxxrwwrite.gms)

Execute "Gdxxrw gdxxrwss.xls set=i9 Rng=sheet1!b20:c21 cdim=1"