The Mobi Dev Centre has just these few lines:
start: if the "start" type of subitem is present, the action defined in the onclick is performed whenever the ebook is opened. Use this in dictionaries to make the dictionary open on the first page every time instead of the last page read. The last page read is not very useful in a dictionary.
<guide> <reference type="start" title="Start here" href="starthere.html"/> </guide>
Doesn't look like it is always present, nor that it can't be made to point anywhere desired.
bob
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