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sy-langu : User’s logon language
sy-mandt : Client in which the user is logged on
sy-uname : Username of the current user
sy-datum : Current application server date
sy-uzeit : Current application server time
sy-tcode : Current transaction code
sy-uline : Horizontal line with length 255
sy-vline : Vertical line
sy-index : In a Do or While loop, Sy-index contains the number of loop passes including the current pass
sy-tabix : Current line of an internal table
sy-dbcnt : Number of table entries processed
sy-subrc : Return code, set by ABAP statements. If SY-SUBRC = 0, the statement was executed successfully
sy-ucomm : Function code (ENTER) that triggered the PAI event
sy-pagno : Current page during list creation
sy-lsind : Index of the list currently being created
sy-linsz : Line width in the list
sy-linno : Current line during list creation
sy-linct : Page length of the list
sy-linni : Current line number
sy-colno : Current column during list creation
sy-title : Text that appears in the title bar of the screen (display window)
sy-srows : Number of rows on the current screen (current number of lines in display window)
sy-scols : Number of columns on the current screen (current columns in display window)
sy-pfkey : GUI status of the current screen
sy-toccu : Contains the initial amount of memory allocated to the relevant internal table
sy-tfill : Contains the number of lines in the relevant internal table
sy-fdpos : Location of hit in string operations
sy-abcde : Contains the alphabet
sy-repid : Name of the current ABAP program
sy-dynnr : Number of the current screen
sy-cprog : Name of the calling program in an external routine or name of the current program
sy-sysid : R/3 System name
sy-opsys : Operating system of the application server
sy-host : Application server
sy-dbsys : Central database system