Starwood Preferred Guest - SPG Award room type on web? What does it mean?

Just curious to know what are these room type (A,B,C,D,F,W,X) stand for?


Room Type: B
Room Description: SPG AWARD ROOM
Bed Type: 2Q
Feature: SMOKING

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Room Type: C
Room Description: SPG AWARD ROOM
Bed Type: K
Feature: SMOKING

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Room Type: D
Room Description: SPG AWARD ROOM
Bed Type: 2Q
Feature: SMOKING

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Room Type: F
Room Description: SPG AWARD ROOM
Bed Type: 2Q
Feature: SMOKING

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All is explained right here:

http://www.flyertalk.com/forum/Forum74/HTML/001249.html

Best regards,

William R. Sanders
Specialist, E-Communications Department
Starwood Hotels & Resorts Worldwide

guest.forum@starwoodhotels.com