| DclExecCommand (OSEXEC) | Run the os command. | 
| DclGetEnv (OSGENV) | Get the value of an environmental variable. | 
| DclGetArgumentNum (OSQARN) | Get N of Arguments command line number. | 
| DclGetArgument (OSGARG) | Get command line Arguments of a N number. | 
| DclAbort (OSABRT) | Conduct error process and force to shut down. | 
*The corresponding f77 interface name in parentheses.