| 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_IN_BIT | integer |
| GL:NCHRSPW | WORD_LENGTH_IN_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 |