Seeking explaination for one of the ABAP statement

Hi,

I was digging in one of standard SAPScript driver program.

I came across a statement which is very new to me.

What does the following mean ?

IMPORT PRLST_TMP FROM MEMORY ID 'PPS'.

Can someone tell me if I want to check the contents pf memory ID 'PPS' how do I do it ? I mean which table should I go ?