Unable to understand the BAPI s

hi all...
I have copied a report to a new one. Inthat report they have used user defined tables which i hv already created.there are some user created BAPI s also.But I am not able to know what exactly these BAPI s do. And in the 1st BAPI it is with different syntax and in 2nd BAPI it is with different syntax.
Can u pls chk and tell me what exactly these BAPI s do.and please explain me syntactactically as well.(Mainly the difference )
1.
FUNCTION ZBAPI_DAILY_RATE_IMPORT.
**"Local interface:
IMPORTING
     VALUE(KURST) TYPE KURST_CURR
     VALUE(FCURR) TYPE FCURR_CURR
     VALUE(TCURR) TYPE TCURR_CURR
     VALUE(T_DATE) TYPE GUI_TITLE
     VALUE(T_RATE) TYPE GUI_TITLE
EXPORTING
     VALUE(STATUS) LIKE ZEPO2-ITEXT
TABLES
      T_ZTCURR STRUCTURE ZTCURR
2.
CALL FUNCTION 'ZBAPI_DAILY_RATE_UPDATE'
        EXPORTING
             T_DATE = SY-DATUM
             R_DATE = R_DATE
        IMPORTING
             STATUS = STATUS.
Thanks in Adv
Moderator message - Please ask a specific question - post locked
Edited by: Rob Burbank on Oct 22, 2009 9:50 AM

by the names of bapi's that you have provided..... first one imports data into internal tables or tables and the second bapi updates the data base tables.
they can be normal function modules if there is no use of remote call but seems the program or these bapi's being used as remote calls from external system.
There is nothing much that we can give you based on your question

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