How USCIS knows that you changed your job?

I heard that after you changed your job, your company will a W-? form to IRS. How they know that?

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• 回複：How USCIS knows that you changed your job? -pditty- ♂ (87 bytes) () 06/15/2007 postreply 11:34:09

• report USCIS? or IRS? are your sure? thanks. -9511- ♂ (0 bytes) () 06/15/2007 postreply 11:38:06

• 回複： -pditty- ♂ (97 bytes) () 06/15/2007 postreply 12:27:36