Shapemerge

Hi,

I wanted to make a little script to use Shapemerge but...
In manual it is written :
"ShapeMerge compound objects are not constructable by MAXScript."
so I use :
macros.run "Objects Compounds" "ShapeMerge"
ShapeMerge Operation_Type:1 Remove_Interior_Exterior:0 Output_Sub_Mesh_Selection:0

but how can I add shapes to THIS ShapeMerge ? I don't find.
Thanks for help :-)