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What is ADDR instruction in fragment program?

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I read some code(start with "FP1.0"). I can't understand some instructions. e.x TEX R0, R0, TEX1, RECT; <= What is RECT? ADDR o[COLR], R0, R1; <= What is different compare with ADD? And I can't find instruction manual or tutorial. I'm googling, then finat "ARB Fragment Program Specification" But can't find ADDR, RECT etc... in "ARB Fragment Program Specification". How can I find information of fragment program?

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