no they are just for gamer score (GS)
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The G represents your gamerscore which is the xbox way of rewarding you for completing achievements. In most games there is a 1000 Gamer points to be won.
what is gamer Id
No. A gamer is someone who plays games, that does not mean he is a gamer.
Retro Gamer was created in 2004.
If your refferring to Microsoft Points. Than they are points you buy with a credit card or from a store that allow you to buy game add ons such as maps, themes, and gamer pictures.