MFS paging and BID options

The BID option provides output protection but has a high performance cost (an extra line flow for each message).

When the BID option is specified and the output occurs while between-brackets, IMS waits for a positive response to BID before sending output.

To avoid sending BID while sending MFS-paged output, each input paging request should indicate begin-bracket and change-direction. Each output page then contains only end-bracket and no BID results, because the page is sent while in an in-brackets state.