Following the logon panel CSECT start information, the logon CSECT header contains an array of offsets to the 3270 data stream instructions. The offsets are contained in halfword addresses. Each field in the header contains the following offsets:

Highlighting Attribute Offset

This is the offset to the highlighting attribute instructions for the input field. For a re-prompt, the LOGON command processor highlights the input field and does so only on fields that have this attribute defined.

Highlighting Character Offset

This is the offset to a position on the panel to insert a highlighting character. The LOGON command processor highlights a field by inserting an asterisk in the byte that is pointed to by this offset. For a re-prompt, the LOGON command processor inserts an asterisk in this field if this offset is present.

Field Attribute Offset

This is the offset to the field attribute instructions for the input field. The LOGON command processor uses this field to protect and unprotect a field and does so only on fields that have this attribute defined.

Address of Start of Field

This is the 12-bit address that identifies the starting point of the text on the screen. The 12-bit addresses are described in 3270 Information Display System, Buffer Address Codes. The LOGON command uses this address to identify the input fields that are returned in the TGET buffer.

Length of Input Field

A 2-byte length field of the input area.

Offset to Input Field

A 2-byte offset to the input field.

Reserved

Two reserved halfwords are included in each entry.

The size of the header for each header element of the array is 16 bytes. The IBM-defined fields have the following header order. They are also in the same order in the 3270 data stream instructions that follow the header:

• User ID
• Password
• Account number
• Procedure name
• Region size
• Performance group ID
• New password
• RACF® group ID
• No Mail option
• No Notices option
• Reconnect option
• Operator ID card option
• First command
• SECLABEL
• Installation-defined fields (each entry in the header must be 16 bytes)
• End Header flag (16 bytes of X'FF')

Installations can insert as many installation-defined fields as needed. The fields should conform to the format described above.