The predefined targets are:
self
parent
top
blank
_blank ALWAYS opens a blank page.
Any other target (e.g., new), opens a new window identified by the target tag. Any additional hrefs with target = new will send content to that window. Means:
Click a target=new href 1st time: open new window
Click 2nd time: content sent to the open 'new' window
Since there is no 'focus()' equivalent, the window '_new' may well be hidden, and the user's perception may be that the link "doesn't work".
examples
Using _blank, opens 2 windows.
<a href=http://dontworry.org target=_blank>Dontworry in _blank window</a><BR>
<a href=http://anahataheartyoga.com target=_blank>Anahata yoga in _blank window:</a><BR>
Using _new, opens 1 window:
<a href=http://dontworry.org target=_new>Dontworry in _new window</a><BR>
<a href=http://anahataheartyoga.com target=_new >Anahata yoga in _new window</a><BR> (remember that this window may have been hidden)
window</a><BR> (remember that this window may have been hidden)