*** CSEHDRBK - CSE header record on each CSE track
*
* +-------------------------------------------------------+
* 0 | ISFHHDR |
* +-------------------------------------------------------+
* 8 |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 10 | ISFHUSER |
* +-------------------------------------------------------+
* 18 | ISFHSYSN |
* +-------------------------------------------------------+
* 20 | ISFHDATE |
* +-------------------------------------------------------+
* 28 | ISFHTIME |
* +-------------+-------------+---------------------------+
* 30 | ISFHRECL | ISFHRECS |///////////////////////////|
* +------+------+------+------+------+------+------+------+
* 38 |:HHKEY|:HKKEY|:HRKEY|:HNKEY|:HWKEY|:HCKEY|:HSRKY|:HSWKY|
* +------+------+------+------+------+------+------+------+
* 40 |:HXRKY|:HXWKY|/////////////////////////////////////////|
* +------+------+------+------+------+------+------+------+
* 48 |:HRFLG|:HNFLG|:HWFLG|:HSRFL|:HSWFL|:HXRFL|:HXWFL|//////|
* +------+------+------+------+------+------+------+------+
* 50 | |
* = ISFHMKEY =
* | |
* +-------------------------------------------------------+
* 70 |///////////////////////////////////////////////////////|
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 80 | ISFHHSK |
* +-------------------------------------------------------+
* 88 | ISFHMSK |
* +-------------------------------------------------------+
* 90 | ISFHKSK |
* +-------------------------------------------------------+
* 98 | ISFHRSK |
* +-------------------------------------------------------+
* A0 | ISFHNSK |
* +-------------------------------------------------------+
* A8 | ISFHWSK |
* +-------------------------------------------------------+
* B0 | ISFHCSK |
* +-------------------------------------------------------+
* B8 | ISFHSRSK |
* +-------------------------------------------------------+
* C0 | ISFHSWSK |
* +-------------------------------------------------------+
* C8 | ISFHXRSK |
* +-------------------------------------------------------+
* D0 | ISFHXWSK |
* +-------------------------------------------------------+
* D8 |///////////////////////////////////////////////////////|
* =///////////////////////////////////////////////////////=
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* F0
*
*** CSEHDRBK - CSE header record on each CSE track
|