The Panels parameter block, as defined in panlink.cpy, is shown below for reference.
01 Panels-Parameter-Block. 03 PPB-Function PIC 9(2) COMP-X. 03 PPB-Status PIC 9(2) COMP-X. 03 PPB-Panel-ID PIC 9(4) COMP-X. 03 PPB-Panel-Width PIC 9(4) COMP-X. 03 PPB-Panel-Height PIC 9(4) COMP-X. 03 PPB-Visible-Width PIC 9(4) COMP-X. 03 PPB-Visible-Height PIC 9(4) COMP-X. 03 PPB-First-Visible-Co PIC 9(4) COMP-X. 03 PPB-First-Visible-Row PIC 9(4) COMP-X. 03 PPB-Panel-Start-Column PIC 9(4) COMP-X. 03 PPB-Panel-Start-Row PIC 9(4) COMP-X. 03 PPB-Buffer-Offset PIC 9(4) COMP-X. 03 PPB-Vertical-Stride PIC 9(4) COMP-X. 03 PPB-Update-Group. 05 PPB-Update-Coun PIC 9(4) COMP-X. 05 PPB-Rectangle-Offset PIC 9(4) COMP-X. 05 PPB-Update-Start-Col PIC 9(4) COMP-X. 05 PPB-Update-Start-Row PIC 9(4) COMP-X. 05 PPB-Update-Width PIC 9(4) COMP-X. 05 PPB-Update-Height PIC 9(4) COMP-X. 03 PPB-Fill. 05 PPB-Fill-Character PIC X. 05 PPB-Fill-Attribute PIC X. 03 PPB-Update-Mask PIC X. 03 PPB-Scroll-Direction PIC 9(2) COMP-X. 03 PPB-Scroll-Count PIC 9(4) COMP-X.
The fields relevant to a particular function are explained in the description of that function.