diff --git a/exporter.py b/exporter.py
index d85a29e..aa6d6a0 100755
--- a/exporter.py
+++ b/exporter.py
@@ -44,6 +44,7 @@
       arg = self.args[self.i].strip()
       if arg == "--":
         allow_opts = False
+        self.i += 1
         continue
 
       if arg == "--port" or arg == "-p":
@@ -66,23 +67,44 @@
       self.i += 1
     return (None, ret)
       
-port = 7890
+def usage():
+  print "usage 1: ./exporter.py [--port/-p wrapper_communication_port] [--type/-t (1,3)] [--scale/-s skeletal_scale] input_files..."
+  print "  Exports the given file(s) with the given settings"
+  print
+  print "usage 2: ./exporter.py [--port/-p wrapper_communication_port] -"
+  print "  Reads commands (everything after --port in usage 1) as lines from stdin"
+  print
+  print "usage 3: ./export.py  --help|-h"
+  print "  Shows this help message"
+
+if "-h" in sys.argv or "--help" in sys.argv:
+  usage()
+  sys.exit(0)
 
 (err, args) = ArgParser().parse_args(sys.argv[1:])
 if err is not None:
   print err
+  usage()
   sys.exit(2)
 
-print args
+if "-" in args["input"]:
+  if len(args["input"]) > 1 or "type" in args or "scale" in args:
+    print "If reading from stdin ('-') is specified, no other input may be given"
+    usage()
+    sys.exit(2)
 
-sys.exit(0)
+if not len(args["input"]):
+  usage()
+  sys.exit(0)
+
+port = 7890
 
 s = socket.socket()
 s.bind(("localhost", port))
 
-args = [os.getcwd() + "/GraphicExport.exe"]
-# args = [os.getcwd() + "/GraphicExport.app/GraphicExport.exe", str(port)]
-g = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+exporter_args = [os.getcwd() + "/GraphicExport.exe"]
+# exporter_args = [os.getcwd() + "/GraphicExport.app/GraphicExport.exe", str(port)]
+g = subprocess.Popen(exporter_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
 s.settimeout(0.5)
 s.listen(0)