极重要的表 (TSTC, SYST, TTREE)

1. All transactions are recorded in table TSTC.
2. All runtime system properties stores in table SYST.
3. All menus are stored in table TTREE.  --> 选择TTREE表里面的field TYPE = 'BMENU'.

P.S.  Ctrl + /  跳到打Tcode的框。