Activating the debugging of system functions, also important OK-CODEs

Sometimes we may need to dubug the system functions in SAP.

Enter/hs: This switches into debugging mode and activates the debugging of system functions.

Attached are the important OK-CODES.

Main R/3 Screen
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/nxxxx terminates the current transaction, and starts transaction xxxx 
/n terminates the transaction 
/nend termiantes all separate sessions and logs off 
/nex terminates all separate sessions and logs off without any warning 
oxxxx opens a new session and starts transaction xxxx 
/o lists existing sessions and allows deletion or opening of a new one 
/I terminates current session 
/i1, /i2,... terminates the session with the given number 
Fxxx Starts the transaction Fxxx (only from system menu) 
.xyzw "Fast path": "xyzw" refers to the underlined letters in the menus. 
/*xxxx Starts transaction xxxx and skips the first screen 
=xxxx This entry is still possible for compatibility reasons 
%sc Searches character patterns in lists (like "System - List - Find String") 
%pc Downloads lists 
%pri Prints lists 

Batch input 
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/n terminates the current batch input transaction 
/bdel deletes the current batch input transaction 
/bend terminates batch input processing and sets the session to "Failed" 
/bda switches from "Display errors only" to "Process in foreground" 
/bde switches from "Process in foreground" to "Display errors only" 

ABAP/4 debugging 
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/h This switches into debugging mode. 
/hs This switches into debugging mode and activates the debugging of system functions. 

Buffer commands: 
WARNING: Resetting buffers can significantly change the performance of the system. 
It should therefore only be used where there is a good reason to do so. 
(authorization object (S_ADMI_FCD). The action is noted in the system log. 
/$SYNC resets all buffers of the application server 
/$CUA resets the CUA buffer of the application server 
/$TAB resets the table buffers of the application server 
/$NAM resets the nametab buffer of the application server 
/$DYNP resets the screen buffer of the application server