| 
 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.