Quick question

Just wanted to know, wheres the undo history in blender and how to I increase the number of undo’s?
Oh, in addition to that, when I save and exit blender, then open up the scene again, will my history still be there?

Appreciate any help. thanx.

Some answers here:
http://wiki.blender.org/index.php/Manual/Undo_and_Redo

Don’t know about save and reopen though. Try it and see.