use of copy verb in cobol and cics program

Dear friends

i have got a query on copy verb .how does it actually work.
when we use copy verb in the cobol program we use it for code replacement.

whereas when we use the same copy verb in cics-cobol application we
use it for fetching the mapset from the load library .so here we are not using it for code replacement. can anybody clarify this query.

thanks