InterSystems IRIS List Structures InterSystems IRIS List Structures You can specify an InterSystems IRIS list structure (%List) to ZWRITE as a variable or an expression. ZWRITE displays a list structure as $lb(element1,element2). This is shown in the following example: SET FullList = $LISTBUILD("Red","Blue","Green","Yellow") SET SubList = $LIST(FullList,2,4) SET StrList = $LISTFROMSTRING("Crimson^Azure^Lime","^") ZWRITE FullList,SubList,StrList