Anchor
A link has a head and a tail. _anchor specifies the head of a link.
The tail of a link is specified by name attribute of another command.
When _anchor command is executed, it will active a task command such 
as _go to take an action. 
_anchor "title='label'"
  (go|prev|refresh|br|img)
anchor_
 
The 'title' attribute represents the label of the anchor.	 
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