what is open group

hello abap gurus,

i am naive to BDC progaming,

i was trying to understand a program created when recording a session,

the following line of standard sap program i could not understand,

i tried the F1 help but to no use,

can anyone kindly explain me the meaning of the lines.

******************************************

FORM OPEN_GROUP.

IF SESSION = 'X'.

SKIP.

WRITE: /(20) 'Create group'(I01), GROUP.

SKIP.

• open batchinput group

CALL FUNCTION 'BDC_OPEN_GROUP'

EXPORTING CLIENT = SY-MANDT

GROUP = GROUP

USER = USER

KEEP = KEEP

HOLDDATE = HOLDDATE.

WRITE: /(30) 'BDC_OPEN_GROUP'(I02),

(12) 'returncode:'(I05),

SY-SUBRC.

ENDIF.

ENDFORM.