| GL: RMISS | MISSING_REAL | Real |
| GL: RUNDEF | UNDEFINED_REAL | Real |
| GL: REPSL | TRUNCATION_ERROR | Real |
| GL: RFACT | TRUNCATION_FACTOR | Real |
| GL: REALMAX | MAX_REAL | Real |
| GL: REALMIN | MIN_REAL | Real |
| GL: IMISS | MISSING_INT | Integer |
| GL: IUNDEF | UNDEFINED_INT | Integer |
| GL: INTMAX | MAX_INT | Integer |
| GL: NBITSPW | WORD_LENGTH_information network_BIT | Integer |
| GL: NCHRSPW | WORD_LENGTH_information network_CHAR | Integer |
| GL: IIUNIT | INPUT_UNIT | Integer |
| GL: IOUNIT | OUTPUT_UNIT | Integer |
| GL: MSGUNIT | MESSAGE_UNIT | Integer |
| GL: MAXMSG | MAX_MESSAGE_NUMBER | Integer |
| GL: MSGLEV | MESSAGE_LEVEL | Integer |
| GL: NLNSIZE | LINE_SIZE | Integer |
| GL: LMISS | INTERPRET_MISSING_VALUE | Logical |
| GL: LEPSL | INTERPRET_TRUNCATION | Logical |
| GL: LLMSG | ENABLE_LONG_MESSAGE | Logical |
| GL: DCLRC | CONFIG_FILE | Character |
| GL: DUPATH | USER_DATABASE_DIR | Character |
| GL: DSPATH | SYSTEM_DATABASE_DIR | Character |