Differences between various update modes

Hi,
I am using function module RH_INSERT_INFTY to create some entries in an Infotype table.In this FM, there are for options for the update
1.D - Dialogue update
2. S - Synchronous update
3. A - asynchronous update
4. B - Buffer update
I am not able to decide which mode I have to use and what are the results of each.Can someone expalin me what each one is or provide some study materials to me?

Hi,
There are 3 type of Update modes , A , S and L
A - Asynchronous update. Updates of called programs are executed in the same way as if in the COMMIT WORK statement the AND WAIT addition was not specified.
S - Synchronous processing. Updates of the called programs are executed in the same way as if in the COMMIT WORK statement the AND WAIT addition had been specified.
L Local update. Updates of the called program are executed in such a way as if the SET UPDATE TASK LOCAL statement had been executed in it.
Regards
Kiran Sure

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