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When editing normal map properties, the options Flip X, Flip Y, and Wide specify how the normal map was created. The most common standard is ‘Flip Y’, so this is selected by default. This option depends on the application used to create the normal map.
Procedurals
You can specify a list of procedural textures in this area. Procedurals are useful because they are fully customizable and present infinite detail independent to the resolution, but they are slower to render than bitmaps. This is why Maxwell offers the option to bake any procedural to a bimap file to be used instead. Procedural textures are SHOP nodes and can be found under Maxwell Render / Texture Procedurals in the TAB menu of the SHOP network.
To apply one or more procedural textures to the material you have to give the full paths of the procedural SHOP node separated with spaces, for example /shop/maxwell_brick1 /shop/maxwell_marble1. The procedurals are evaluated from left to right (just like the Photoshop layers).