Diff between Processing and Execution

Could you please Help Me??
what is synchronous processing and Execution.

hi
synchronous processing is that in which the progaram can not continue to execute until u get the response from it.
execution is normal execution of the prgram which can be either synchronous and asynchronous.
<b>example</b>
data: oref type ref to CX_SY_DYN_CALL_ILLEGAL_FUNC,
      text type string .
try.
CALL FUNCTION 'ABAP4_CALL_TRANSACTION'
EXPORTING
    tcode                   = 'SM59'"
"transaction sm59 opens in same session
EXCEPTIONS
    call_transaction_denied = 1
    tcode_invalid           = 2
    OTHERS                  = 3.
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
CASE sy-subrc.
when 1.
    WRITE :/ 'call transaction denied'.
WHEN 2.
    WRITE :/ ' transaction doesnot exist'.
ENDCASE.
catch CX_SY_DYN_CALL_ILLEGAL_FUNC into oref.
text = oref->get_text( ).
endtry.
WRITE / text.
WRITE: / 'End Of Demo For Synchronous RFC'.
regards
ravish
<b>plz dont forget to reward points if helpful</b>

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