What is diference between C,BP-LOOKUP and C

Hi All,
I would like to know the some information about the Platinum Unload parameter SHRLEVEL.
Can any one explain me this parameter in detail with possible values for it ?
What is the diference between C,BP-LOOKUP and C(without BP-LOOKUP) ?
I would like to know the some information about the Platinum Unload parameter SHRLEVEL.
Can any one explain me this parameter in detail with possible values for it ?
What is the diference between C,BP-LOOKUP and C(without BP-LOOKUP) ?