LOCKING THE WHOLE SAP SYSTEM.....

Locking the whole SAP system:-
Using the command tp locksys «SysID» only the user SAP* will be allowed to login. The command tp unlocksys «SysID» cancels the lock.
Connection between SAP R/3 and operating system The command sapevt can be used to trigger an event from the operation system. Thus, a job previously defined within R/3 will be released.
SQL code help Run the command oerr ora «error number» under user ora«SysID».
Oracle import and export explanations Run the command imp help=yes under user ora«SysID». This format can also be used with exp, impst, and expst.

SAP Profile from 3.x to 4.x
SAP_NEW - When you are upgrading from 3.x to 4.x, all the new transaction code are store in this profile. You have to do a mass insert of all the users with the new profile and slowly remove those unathorized transaction once the system start running.
PFCG - The new Authorization transaction. Note : Research based on version 3.0f under Unix, Oracle data base and Windows

SAP Session take over Disabled:-
SAP have disabled the session takeover once you upgrade to 4.6x.
Definitively SAP have blocked the functionality from the kernel.
The original program RSM04000 still exists but it doesn't work anymore.
Alternatively, you can used software like Microsoft NetMeetings.
However, in some of the SAP Version 4.x, you can still echo the user session.
This is how it goes :-
How to Create the Echoed Session :-
a) Make sure the User you want to Echo to is logged onto the same system you are logged onto. b) Rel prior to 4.6B, Execute the SM04 transaction from your logon. Rel 4.6B and later, Execute program RSM04000 from your logon. c) Single Mouse-click to the command input area and key in 'slon' (without the quotes). d) Single Mouse-click to the Userid you want to 'Echo-on' to. e) Hit enter. f) You will now be echoing your screens to the other User. Note: You have not taken over their original session, you have created a new session for the echo.
How to Terminate the Echoed Session :-
a) Return to your SM04 screen display. Single Mouse-click to the command input area and key in 'slof' (without the quotes). b) Single Mouse-click to the Userid you want to 'Echo-off'. c) Hit enter.
Note: This will remove your Echoed session screen from the Users screen, but leave the User logged on with their original session.