Here is an useful file to understand the codes on your approval letters.

[BJSR]

I am posting this again as there are many who are not sure of what the codes are on their approval notices.

Here is an excel file I have found which may be helpful to see the codes on your approval letter and figure on what category your GC is approved. Also in each category there are different codes based on your expertise. So help yourself.
http://www.ins.gov/graphics/aboutins/statistics/statyrbook96/table5.xls

 

[metoo]

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Thanks BJSR! heartening to see that u are still here for helping..

 

[Mera_Kya_Hoga]

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Hi BJSR,

How is life after GC? Hope you are enjoying your freedom