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esriViewDrawPhase.esriViewDrawBackground relates what?

Question asked by kjulistened on Nov 1, 2013
Latest reply on Nov 1, 2013 by kjulistened
I got some information ref esri help:

It says that esriViewDrawBackground relates to the 'bottom layer',I confuse about this and I saw some code like:
axMapControl1.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null);

after tracking a new regtangle to show.