Answer Posted / rajeshwar rao

SAP Memory
SAP memory is a memory area to which all main sessions
within a SAPgui have access. You can use SAP memory either
to pass data from one program to another within a session,
or to pass data from one session to another. Application
programs that use SAP memory must do so using SPA/GPA
parameters (also known as SET/GET parameters). These
parameters can be set either for a particular user or for a
particular program using the SET PARAMETER statement. Other
ABAP programs can then retrieve the set parameters using the
GET PARAMETER statement. The most frequent use of SPA/GPA
parameters is to fill input fields on screens

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