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Functions that are connected to the operating system.
| Name | Description | 
|---|---|
| Chdir | Change working directory | 
| Getdir | Return current working directory | 
| Halt | Halt program execution | 
| Paramcount | Number of parameters with which program was called | 
| Paramstr | Retrieve parameters with which program was called | 
| Mkdir | Make a directory | 
| Rmdir | Remove a directory | 
| Runerror | Abort program execution with error condition |