yes it is, check page 228 in GDL reference guide, it was several years ago I used this, but something like :
IF [global_parametername] = homestory THEN
ELSE IF [global_parametername] = onestoryup THEN
ENDIF
My script above isn't true GDL, just how you should think. (if MATHA stands for Mats Ha..., then you have one of those objects in you collection)