public OgreRenderTechnique CreateTechnique()

Public Function CreateTechnique As OgreRenderTechnique

A Technique is a single way of rendering geometry in order to achieve the effect you are intending in a material. There are many reason why you would want more than one - the main one being to handle variable graphics card abilities; you might have one technique which is impressive but only runs on 4th-generation graphics cards, for example. In this case you will want to create at least one fallback Technique. The engine will work out which Techniques a card can support and pick the best one.

If multiple Techniques are available, the order in which they are created is important - the engine will consider lower-indexed Techniques to be preferable to higher-indexed Techniques, ie when asked for the 'best' technique it will return the first one in the technique list which is supported by the hardware.