| 
            PLINT
            plsetopt
          ( | opt , | 
| optarg ); | 
      Set any command-line option internally from a program before it invokes
      plinit. opt is the name of the command-line
      option and optarg is the corresponding command-line
      option argument.
    
opt
          (PLCHAR_VECTORAn ascii character string containing the command-line option.
optarg
          (PLCHAR_VECTORAn ascii character string containing the argument of the command-line option.
This function returns 0 on success.
      Redacted form: plsetopt(opt, optarg)
    
This function is used in example 14.