The POSITION specifier asks the position of the file. It takes the following form:
|'REWIND'||If the file is connected with its position at its initial point|
|'APPEND'||If the file is connected with its position at its terminal point (or before its end-of-file record, if any)|
|'ASIS'||If the file is connected without changing its position|
|'UNDEFINED'||If the file is not connected, or is connected for direct access data transfer and a REWIND statement has not been performed on the unit|
For More Information:
For details on record position, advancement, and transfer, see your user manual or programmer's guide.