Two Message Servers in one System

Dear all.
I learned from http://help.sap.com/saphelp_nw04s/helpdata/en/84/54953fc405330ee10000000a114084/content.htm that one SAP system has one central instance which contains one message server. But our system seems to have two message servers.
Our system ID is "ABC". When I open the SAP Management Console, there are three children nodes under our system: One blue database icon named "ABC" and two green icons named "ABC 14" and "ABC 31". Under "ABC 14", there are nodes "ABAP WP Table" and "J2EE Processes Table". In addition, there's a "Process List" node here. The processes include "msg_server.exe", "disp+work.exe", and "igswd.exe". Under "ABC 31", there's no "ABAP WP Table" or"J2EE Processes Table". There's only one node "Process List". It contains "msg_server.exe" and "enserver.exe".
My questions are:
1. What are "ABC 14" and "ABC 31"?
2. Does "ABC 14" contains at least two instances? One is for Java and another is for ABAP?
3. What's the role of "ABC 31"? It seems to only contain enque server and message server.
4. Why are there two message servers in a single system "ABC"? One is under "ABC 14" and another is under "ABC 31".
Thanks + Best Regards
Jerome

Hi Sunil,
Thanks a lot for the clarification. Just have a little bit confusion left.
1. Since there're two message servers, may I say that there are two central instances? Or these message servers belong to a single central instance?
2. There's no "enserver.exe" in ABAP instance. So is the "enserver.exe" in the JAVA instance also responsible for the ABAP enque and deque operations?
Thanks + Best Regards
Jerome

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