What is qRFC monitor in SAP (BC-MID - Middleware)?

SAP Term: qRFC monitor

• Component: BC-MID

• Component Name: Middleware

• Description: Central monitoring tool in the SAP System for asynchronous data transfer when using the queued Remote Function Call qRFC between two SAP Systems or between SAP and external systems. There is an qRFC monitor for the outbound queue and the inbound queue. It is used to: Display the current status of a queue for example, status or number of entries in a queue Lock or unlock specified queues

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• Key Concepts: 
  qRFC (queued Remote Function Call) is a type of communication protocol used in SAP systems to enable asynchronous communication between two SAP systems. The qRFC monitor is a tool used to monitor the status of qRFC calls and to troubleshoot any errors that may occur. 
  
  How to use it: 
  The qRFC monitor can be accessed through the SAP GUI by navigating to the transaction code SMQ1. This will open the qRFC monitor, which displays all of the qRFC calls that have been sent and received. The monitor also displays the status of each call, such as whether it was successful or not. 
  
  Tips & Tricks: 
  When troubleshooting qRFC errors, it is important to check the status of the call in the qRFC monitor. If an error has occurred, it will be displayed in the monitor and can be used to help identify the cause of the error. 
  
  Related Information: 
  The qRFC monitor is part of the BC-MID Middleware Infrastructure component in SAP systems. Other components in this infrastructure include tRFC (transactional Remote Function Call) and sRFC (synchronous Remote Function Call).