Header/Footer Direction

I played with header / footer settings on a per document basis and saw a setting, I have never seen before. Perhaps it was there all the time but I did not recognize it.

The option sets the header / footer  to the left or right side of the page.  The strange thing about is, that the option only appears on Windows 7 and Linux but not on XP.

When you set the direction to “right2left”, a new field ($HFFlags)  is created in the document. The field value is set to “R”.  When setting the direction to “left2right” the field is removed.

The $HFFlags field also controls the “Print header and footer on first page” option.