Purpose of SM13 and LBWQ in LO extraction

Hi,

Could any body pls explain, what i purpose/role of SM13 and LBWQ.

How delta updated in RSA7.

and finally wat i role/work of LBWE Update mode (direct delta, queued delta, V3 unserilized update), from where its picks the data and trasfer to delta queue(RSA7)

Pls explain in details.

Regards

pavan