JCO send a list of IDocs, confirm or rollback

Hello!

In my current JCo IDoc project, i would like to send a list of IDocs and then use confirmTID to commit the transaction for all IDocs in this list. Is this possible or is a TID only valid for one IDoc?

Second question: what is the best practice to "undo" (or "rollback") sending an IDOc? Do i use abort() or disconnect()?

Many thanks in advance,

Michael