Doubt in ALV

can any one tell ,what is '&IC1' ? why we use that? can any one explain the below code........

FORM DISPLAYDETAILS USING UCOMM LIKE SY-UCOMM

SELFIELD TYPE SLIS_SELFIELD.

IF SELFIELD-FIELDNAME = 'EBELN'.

IF UCOMM = '&IC1'.

READ TABLE I_OUT INDEX SELFIELD-TABINDEX.

PERFORM PORECDNG.

CLEAR BDCDATA[].

ENDIF.