How to reset buffer on SAP Server

Some-time its needed to reset some buffers in SAP For performance issues So here iam sharing the differnt buffer cleanup T-codes.
But Keep n mind Resetting of the buffers could change the performance of the entire system

/$DYNP - reset the screen buffer of the application server
/$SYNC - resets the buffers of the application server
/$CUA - resets the CUA buffer of the application server
/$TAB - resets the TABLE buffers of the application server
/$NAM - the nametab buffer of the application server

How to send Message to Specific user on SAP

Some-times we need to send a specific message to specific user in SAP which is not possible by using SM02..SO here is the trick to do it :

Use function module TH_POPUP
goto Transaction code SE37 enter the function module name & test run it
the the resulting screen is shown below, type the details and execute.
The user must be logged into the system to receive the message