CompuServe Messages

A pxp I am writing needs to iterate through a list of objects that were selected before the plug-in was invoked -can a pxp have access to the list of currently selected objects? If not, is it possible to include functionality within the pxp to let the user select multiple objects? The EXP_PICK_OBJECT message handles one selection only and it does not 'color' the selection like the 3DS editor does. Can I offload this chore to 3DS without having to write a select/deselect handler that also would also need to update the screen? Thanks for any help. Philippe Lourier