Partha,
The CURSOR IS is defined in the SPECIAL-NAMES paragraph of the CONFIGURATION SECTION of the ENVIRONMENT DIVISION of your program containing the SCREN SECTION. The following is from the product documentation :
CURSOR IS data-name-1
The CURSOR IS clause specifies the data item to contain the cursor address used by the ACCEPT statement.
At the start of an ACCEPT statement, if data-name-1 contains a value that is a valid character position on the screen, that position is used as the initial position for the cursor. Otherwise, data-name-1 is ignored, and the initial position for the cursor is the start of the first input field on the screen. At the end of an ACCEPT statement, if the position in data-name-1 has been used in that statement, data-name-1 is updated to show the position of the cursor at the termination of the ACCEPT statement.
CURSOR IS has no effect on the positioning of fields on the screen.
Data-name-1 must be 4 or 6 characters in length. If data-name-1 is 4 characters in length, the first two characters are interpreted as line number, and the second two as column number. If data-name-1 is 6 characters in length, the first three characters are interpreted as line number, and the second three as column number.
The clause has no effect if data-name-1 contains an illegal position (for example, zeros, a nonnumeric value, or a value that is beyond the bottom of the screen).
If data-name-1 contains a valid position that does not correspond to an input field being accepted by the current ACCEPT statement, the cursor is positioned to the next such field or, if there is none, to the first such field. The ordering of the fields is the order in which their descriptions appear in the Data Division.