I/O PCB or AIB, I/O Area, I/O Area Length, IO Area, area
         length, area, …

I/O PCB

Pointer to the PCB that represents a destination

AIB

Specifies the application interface block (AIB) that is used for the call. This parameter is an input and output parameter.

The following fields must be initialized in the AIB:

AIBID Eye catcher.

This 8-byte field must contain DFSAIBbb.

AIBLEN AIB lengths.

This field must contain the actual length of the AIB that the application program obtained.

AIBRSNM1 Resource name.

This 8-byte, left-justified field must contain the PCB name IOPCBbbb.

AIBOALEN I/O area length.

This field must contain the length of the I/O area that is specified in the call list. This parameter is not used during the XRST call. For compatibility reasons, this parameter must still be coded.

I/O Area Length

No longer used. For compatibility reasons, this parameter must still be included in the call, and it must contain a valid address.

I/O Area

Used to specify the check point ID from which the program should be restarted. If the program is to start normally, the first 5 characters of I/O area must be blanks.

Area length

Specifies a 4-byte field in your program that contains the length in binary of the first area to checkpoint. This parameter is an input parameter. For each area length, you must also specify an area parameter. The number of areas you specify on a XRST call must be less than or equal to the number of areas you specify on the CHKP calls the program issues.

Area

Specifies the area in your program that you want IMS TM to restore. Always specify the area length parameter first, followed by the area parameter.