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[edit] How do I add multiple materials to an object?

See http://mediawiki.blender.org/index.php/Tutorials/Multiple_Materials.

[edit] I accidentally tweaked the texture space of an object with t key. How can I reset it?

Set Buttons Window -> Editing -> Link and Materials -> AutoTexSpace on and hit tab key twice on 3D Viewport to visit Edit Mode of the object.

Blender FAQ: Index | Questions | Manual | Blender Version 2.42a