Barnes & Noble Nook Tablet Mode D'Emploi

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Barnes & Noble NOOK Tablet User Guide 
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Clearing Search Shortcuts
When you search for items and select search results, your NOOK stores the search results you select as shortcuts 
for future searches. 
To clear the list of search-result shortcuts, do this:
1.  On the Settings screen, tap Search.
2.  Tap the menu choice Clear search shortcuts
A dialog box appears, explaining that this will clear shortcuts to recently searched items.
3.  Tap OK.