Isnt it annoying when you want to do long animations , want to render in 5 minutes , not picky about detail , but crud! , The insides of hair doesnt show up in preview mode , so if your looking side on at hair at maybe the bangs that stick out , sometimes they will be invisible . Well heres how to get the inside of hair  to show in Preview mode.

Step 1) Load Hair
Step 2) Do the morphs and colours you want
Step 3) Use group tool to reverse normals on this hair. ( should look wierd now)
Step 4) Duplicate this hair
Step 5) On the duplicate , reverse normals again.
Step 6) Conform both hairs to your character.
Step 7) Make sure to preview render with Enhanced multilayer Transperency. (poser7)

• PS - reason for first making reverse normals then re-reversing is to get round a colour bug in poser.

Now you should have a preview mode that has the insides of hair shown!!!