When to use Perform Changing and using. and Table

Hi,
What is use of Perform chaging and using ?
in what situation we need to use it ?

Hi Jim,
PERFORM: PERFORM command is used to call an ABAP subroutine (form) from any program, subject to the normal ABAP runtime authorization checking.Such calls to subroutines can be used for carrying out calculations, for obtaining data from the database that is needed at display or print time, for formatting data, and so on.
PERFORM commands, like all control commands, are executed when a document is formatted for display or printing. Communication between a subroutine that you call and the document is by way of symbols whose values are set in the subroutine.
ABAP Subroutine example is given in this link
http://help.sap.com/saphelp_nw70/helpdata/en/9f/db979d35c111d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/d1/803279454211d189710000e8322d00/content.htm
Passing the values in an internal table has many scenarios like pass by value pass by reference pass by value and referenceSuch scenarios are well explained in the following link
http://help.sap.com/saphelp_nw70/helpdata/en/9f/db979035c111d1829f0000e829fbfe/content.htm
Revert for further clarification,
Thanks and Regards
Srikanth.P

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When to use Perform Changing and using. and Table

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