SMIV (Show Maps In Viewports)
"Turn viewport display for any material channel on and off. Works with selections or the whole scene. Supports most MAX3 Shader types and the Raytrace material. NEW: Support for most composite Materials with Sub-Materials - Blend. Double-Sided. some 3rd party Materials etc. Added support for Composite Texture Maps with more than one sub-map: Composite. Mask. Map.
Updated to work in R4 By Swami Lama"