Put this in a text file, give it a .bat extension (example: render.bat) and drag and drop this file onto an XSI prompt.
xsibatch -guilic -r -scene D:renderscenesedswork_scene1.scn
xsibatch -guilic -r -scene D:renderscenesedswork_scene2.scn
xsibatch -guilic -r -scene D:renderscenesedswork_scene3.scn
Typing xsibatch -r -h in a command prompt will list all the commands.