Setting this variable ON causes all invocations of I$IO using the EXECUTE opcode to unlock all records. Normally records are unlocked when a transaction finishes. But if users do their own transaction management using sql.acu (which calls I$IO using the EXECUTE opcode), the interface never knows to unlock records, because it doesn't check the text sent to the database to see if it associated with a transaction. While the default value is "Off" (false, no), this configuration variable can also take the value of "On" (true, yes).