Help with perform statement

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Hi all,

I have this perform statement

data: gt_outtab type table of mara,

gt_fieldcat type lvc_t_fcat.

perform create_and_init_alv changing gt_outtab

gt_fieldcat.

when i double click on this perform ian getting a form like this

FORM create_and_init_alv CHANGING P_GT_OUTTAB

P_GT_FIELDCAT.

ENDFORM. " create_and_init_alv

when i look at the sap standard program for the same perform statement

it has something like this

perform create_and_init_alv changing gt_outtab

gt_fieldcat.

form create_and_init_alv changing pt_outtab like gt_outtab[]

pt_fieldcat type lvc_t_fcat.

ENDFORM.

my questions are

1)can anyone tell me why there is a difference

2) do we need to writ things again in form like gt_outtab[] and type lvc_t_fcat as you see in sap standard code.

what is the purpose of it.

Thanks

Kajol