NAME:testvar PURPOSE:une sorte de keyword_set mais qd la valeur existe renvoie celle-ci CATEGORY:comme keyword_set CALLING SEQUENCE:res=testvar(var=variable) INPUTS:rien KEYWORD PARAMETERS:var : n''importe quoi OUTPUTS:0 si la variable n''existe pas COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: EXAMPLE: IDL> print, testvar(var=toto) 0 IDL> print, testvar(var='toto') toto