sfr P1 = 0x90; /* SFR for P1 */

i was download the code from internet

the program is start with these lines
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sfr P1 = 0x90; /* SFR for P1 */

sbit P1_0 = P1^0; /* SFR for P1.0 */
sbit P1_1 = P1^1; /* SFR for P1.1 */

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what is the function of this code

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