Regarding parameters in rfc

hi all,
can any one explain me why RFC does not support the u201Cby referenceu201D mechanism , as i want to pass table parameter to rfc how they wil be passed without u201Cby referenceu201D .
thanks in advance
dilip

When you make a remote function call, the system handles parameter transfer differently than it does with local calls.
TABLES parameters
The actual table is transferred, but not the table header. If a table parameter is not specified, an empty table is used in the called function. The RFC uses a delta managing mechanism to minimize network load during parameter and result passing. Internal ABAP tables can be used as parameters for function module calls. In a local function module call, a parameter table is passed on by reference, and no new local copy has to be created. RFC does not support the u201Cby referenceu201D mechanism, so the whole table has to be exchanged between the RFC client and the RFC server. When the RFC server receives the table entries, it creates a local copy of the internal table. Then only delta information is returned to the RFC client. This information is not returned to the RFC client every time a table operation occurs, however; instead, all collected delta information is passed on at once when the function
returns to the client.
The first time a table is passed, it is given an object-ID and registered as a "virtual global table" in the calling system. This registration is kept alive as long as call-backs are possible between calling and called systems. Thus, if multiple call-backs occur, the change-log can be passed back and forth to update the local copy, but the table itself need only be copied once (the first time).

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