Concept/use of temporary tab

Hi,

I am a functional consultant and using temporary table concept on writing some enhancement.

I want the temporary table to store the data archived from the SAP Objects. I just want to confirm that is it possible to use that data in temporary table to display anytime during the transaction process. And the second question is that what is the period till which the data in temporary table exists in the system so that I can take the reference of same as a information while executing some functionality.

To explain my question in details. Here is my business scenario

My scenario is that during the notification save event, function module will get triggered and identify the parameters from notification and store it in a temporary table. Before, this process my function module will carry the checks defined and say that the notification seems to be repetitive and then only it can store that data in temporary table. Now when there are some entries in the table the this table alongwith some warning message should get pop us during the notification save process. Is it possible?

Thanks