ADMIN: Catalog → Attributes → Manage Attributes
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This option defines how the attribute you are working can be used by Magento. If the value is set to
Yes then Magento will only allow any single label/option of this attribute to be used once and only once by any product. So if one product has already selected a label/option in this attribute list, then no other product my select that same value.
In contrast, if the value is set to
No then multiple products my share the same value for this attribute.
The option sets whether Magento will require the attribute have a value selected when creating the product. If this option is set to
No then you can create a product with this attribute and have this specific attribute be left blank
Meaning of the properties options for frontend
Adds this option to the quick search options
Adds this option to the advanced search options
Adds this option to the comparable views
Added this attribute to the layer navigation panel when products have this attribute are displayed in the list
Added this attribute to the layer navigation panel when products have this attribute are displayed in the search results
Position of attribute in layered navigation block
Allow attribute values that have HTML tags enclosing them to have those HTML tags honoured.
Adds this option to the product view details
By setting this option to Yes the attribute gets added to the Flat product table. This allows the display or and attribute able to be Selected as part of a lookup in the database.
So For example for new products the news_from_date and news_to_date need to be present in the flat product table for them to be used when “Use Flat Catalog Product” is selected in the Configuration→Catalogue→Frontend→Use Flat Catalog Product
By setting this option to Yes the attribute gets added to the default sort options. So at the bottom of the product list this attribute can be chosen as a sort option.
tbd very nice