In text, move to the front.
On a term, move down, with some qualifications determined by the display forms involved.

1:	The default is to move down to the leftmost child that is a term.

2:	But some display forms are defined so that this command will move down into a text field. When this happens the point is placed at the end of the text, and the whole text becomes selected in anticipation of cut-n-paste on the text.

3:	Some display forms are defined so that this command will pass through them; often these are invisible.

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html