1)SE37然后如图操作
使用函数 'NAVIGATION_SET_START_TCODE' ,用该函数可以设置用户和一个TCODE，该TCODE当用户登录sap系统后就可以自动执行。sap对应的程 序：ADMIN_SET_START_TRANSACTION_FO
2)使用用户出口(user Exit)
该用户出口的模块名称是：SUSR0001，你可以在该单元里增加你的代码进行相应的控制。.
SAP用户登录增强示例
* Transaction CMOD -> Utiliteis -> SAP Enhancements
* Exit Name SUSR0001
* Double click EXIT_SAPLSUSF_001
* Double click ZXUSRU01
* Insert -> include zsesschk.
** zsesschk limits the number of login sessions per user
* in a certain client
* It runs from user exit SUSR0001 after the SAP Login
* n-1 is the number of concurrent sessions allowed
TABLES: UINFO.
DATA: N TYPE I VALUE 2. "Upper limit of login sessions
DATA: OPCODE TYPE X VALUE 2, I TYPE I, A(60).
DATA: BEGIN OF BDC_TAB1 OCCURS 5.
INCLUDE STRUCTURE BDCDATA.
DATA: END OF BDC_TAB1.
DATA: BEGIN OF USR_TABL OCCURS 10.
INCLUDE STRUCTURE UINFO.
DATA: END OF USR_TABL.
* Exclude Limit login by Users
IF SY-UNAME <> 'XXX'
AND SY-UNAME <> 'XXX'.
CALL 'ThUsrInfo' ID 'OPCODE' FIELD OPCODE
ID 'TAB' FIELD USR_TABL-*SYS*.
LOOP AT USR_TABL.
IF SY-UNAME = USR_TABL-BNAME AND SY-MANDT = USR_TABL-MANDT.
I = I + 1.
ENDIF.
ENDLOOP.
IF I >= N.
A = 'You have already '.
A+17(2) = I - 1.
A+19(25) = 'login sessions in client '.
A+44(4) = SY-MANDT.
CALL FUNCTION 'POPUP_TO_INFORM'
EXPORTING
TITEL = 'UNSUCCESSFUL LOGIN'
TXT1 = A
TXT2 = 'You are not allowed to log in'.
MOVE: 'SAPMSSY0' TO BDC_TAB1-PROGRAM,
'120' TO BDC_TAB1-DYNPRO,
'X' TO BDC_TAB1-DYNBEGIN.
APPEND BDC_TAB1.CLEAR BDC_TAB1.
MOVE: 'BDC_OKCODE' TO BDC_TAB1-FNAM,
'/nex' TO BDC_TAB1-FVAL.
APPEND BDC_TAB1.CLEAR BDC_TAB1.
CALL TRANSACTION 'SM04' USING BDC_TAB1 MODE 'N'.
ENDIF.
ENDIF.
