BTAB
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Function
The BTAB statement simulates the Back Tab key on a display terminal. The Back Tab key moves the cursor to the beginning of the preceding input field on the simulated panel if the cursor is currently positioned at the first character position in a field. If the cursor is currently positioned in an input field but not at the first character, the Back Tab key moves the cursor to the beginning of the current input field. This statement is valid for simulation of 3270 terminals only.
Examples
cursor(index(screen,'MYFILE')) /* Position cursor on MYFILE. */
btab /* Back up to the input field */
/* before MYFILE. */