Difference between TRFC and QRFC

Dear all,
i understand that TRFC functions as EO and QRFC functions as EOIO.
but can anyone of u pls make me understand there significance with a practical example :
1. in terms of XI
2. without XI when we say that one R3 is connected to other with say TRFC or QRFC
pl help

Hi! Tarang,
I just adding few points in this forum...Actually your question and some of the answers given are different .Some of them are deviating the topic.
According to my knowledge and as per SAP documentations also I am adding these points. Correct me if I am wrong.
At first QRFC , TRFC are different from the BE, EO and EOIO because trfc are message protocols and BE , EO and EOIO are nothing but Quality of Services (QOS).
You can check this in the below URL::
http://help.sap.com/saphelp_nw70/helpdata/EN/0d/5ab43b274a960de10000000a114084/frameset.htm
QOS is one of the property of TRFC's.
1) See Got o SMQ1 an SMQ2 what you will found:: ?
QRFC Monitor Outbound Queue and QRFC Monitor Inbound Queue. both Queues QRFC s common.ok its a simple thing.
2) Also lets take IDOC Adapter for IDOC whether it may be File to IDOC or IDOC to File Scenario where you will monitor the IDOC in SM58 also right ? why because this TRFC's are mainly for communicating with one SAP system to another SAP System. IDOC is mainly sending data via TRFC ports. That is why you ill monitor the IDOC if data doesn't reached means in Transaction COde:: SM58.
3) QRFC Outbound and QRFC Inbound is mainly for communicating with SAP System and Non SAP Systems. Okay you can get this information in the below further explination and link.
Note::qRFC communication is an extended form of tRFC communication. It adds a serialization concept to the transactional concept of tRFC.
http://help.sap.com/saphelp_nw70/helpdata/EN/3b/befa40badbf46fe10000000a1550b0/frameset.htm
Some applications use qRFC with outbound queue to improve system performance and not for serialization. If this is the case, you can switch automatically from the qRFC LUW with outbound queue to the tRFC LUW to avoid a hanging queue if a SYSTEM_FAILURE occurs
Note:: To cancel a background job if tRFC errors occur use program RSARFCEX to restart tRFC.
First What is the purpose of RFC:: ?All types of applications are instructed to communicate with other applications. This communication may take place within an SAP system, with another SAP system, or with an application from a remote external system. An interface that can be used for dealing with this task is the Remote Function Call (RFC). RFCs can be used to start applications in remote systems, and to execute particular functions.
There are 3 types of communications::
Communication within an SAP system or with a remote system can take place using Remote Function Call (RFC). This enables the following scenarios:
·      a) Communication between two independent SAP systems
       b) Communication between a calling SAP system and an external receiving system
       c) Communication between a calling external SAP system and an SAP system as the receiving
            system
Features of the Three Communication TypesTo help you decide which communication types you need to implement according to your system landscape and your requirements, the advantages of the three types of communication are explained below:
... 1)      tRFC
Suitable only for independent function module calls; the sequence of the calls is not preserved
·   2)   qRFC with outbound queue
Function modules in a queue are guaranteed to be processed only once and in sequence (serialization). Also suitable for communication with non-SAP servers.
·   3)     qRFC with inbound queue
The function modules created in the outbound queue are transferred from the outbound queue to the inbound queue; the sequence of the function modules is preserved. An inbound scheduler processes the inbound queues in accordance with the specified resources. Both the client and the server system must be SAP systems. One work process is used for each inbound queue.
http://help.sap.com/saphelp_nw70/helpdata/EN/3b/befa40badbf46fe10000000a1550b0/frameset.htm
http://help.sap.com/saphelp_nw70/helpdata/EN/e7/555e3c0f51a830e10000000a114084/content.htm
XI point of View...
Basically Once the TRFC or QRFC is funtion is over XI will place the Message into the Adapter engine queues based on the Comminication channel configuration.
Suppose if it is and EO then XI ill place the message in any Queue based on the free and priority and if configuration is done as per EOIO then XI ill place all the messages in the Same queue name so that it ill processes in order one after another and if the above message fails and remaining all other messages will be in the queue and doesnt process untill the failed mesages gets removed
But in case of EO it may be places in any queue and if one message fails then another message of same interface may processed sucessfully based on another queue order.
I hope it wil be helpful to you...
Regards::
Amar Srinivas Eli

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