Reading pointer format in S7

I use a lot of data organised as a struct in a db. Now I read in this struct as an in-parameter in a function. The in-parameter is specified as 'pointer', so at the inside of the block I can determine the datablock, and the startadress.
However, if I don't want to use an in-parameter, is there a way to detect the pointerdata af the struct (datablock and startadress)?

IN : POS_OBJECT_X : pointer


L P##POS_OBJECT_X
LAR1
L W [AR1,P#0.0]
T #TempDBX
L D [AR1,P#2.0]
LAR1
OPN DB [#TempDBX]

Please re-state your question another way using a specific example of what you are trying to do.