| Index | NAME | Function |
|---|---|---|
| 12.1 | NERROR | FMS error number. Read-only |
| 12.2 | IOSTAT | I/O status returned from last system call. Read-only |
| 12.3 | LUERR | Unit number for writing error messages |
| 12.4 | IPRERR | Information to print if an error occurs |
| 12.5 | IERROR | Action to take if a fatal error is detected |