What is the pipeline and what is a pipeline services?

Ans:Receiver Identification,Interface Identification,Message Branch,Reguest Message
Mapping,Outbound Binding,Call Adapter.

OR

Pipeline Steps:they are 6steps
1.Receiver Determination.
2.Interface Determination.
3.Msg Spilt:If more than one receivers are found XI will initiate new msg for each
receiver.
4.Message Mapping:Mapping program to transform source msg to destination msg.
5.Technical routing:Bind a Specific destination and protocal to the msg.
6.Call Adapter:Send the transformed msg to the adapter or proxy.

What are the Steps required to configure a scenario?

Ans: 1. Create your communication channel.
the communication channel is the means using which XI gets and passes information. XI can understand only XML and so, the communication channels ( or adapters ) do the task of passing XML messages to and from XI. If the message is not in XML format, content conversion is performed at the Adapter.
2. Create your sender and receiver agreement.
Whenever XI is the recipient of some information, you create a sender agreement for the corresponding adapter, sender system and sender interface. Whenever XI is going to send some information to an external system, as the external system is the recipeint of the information, create a receiver agreement for the same.for IDOC and HTTP adapters, no sender agreement is required.
3. Receiver Determination: In this stage, you tell XI, the recipient Interface of the scenario. You can also provide conditions on which the receiver is determined.
4. Interface Determination: The stage where the Inbound Interface and the Interface mapping program are defined. Conditional Interface determination is also possible.

What is the message flow in SAP XI?

Ans) inbound handling, receiver determination, interface determination, channel determination, mapping, outbound handling.