Joined: 23 Nov 2006 Posts: 19254 Location: Inside the Matrix
"Double Word Boundary" is not specific to COBOL.
Double word boundary refers to an address that is evenly divisable by 8, so addresses that end with 0 or 8. Addresses that end with these are "double word boundary aligned". (And thanks to DBZ for spotting my initial brain fade. . .).
This is important because there are some machine instructions that require double-word boundary alignment.