| AddDisk | Add disk definition to list if drives (Unix only) | 
| DiskFree | Get free size on Disk. | 
| DiskSize | Get total size of disk. | 
| DosExitCode | Exit code of last executed program. | 
| DosVersion | Current OS version | 
| DTToUnixDate | Convert a DateTime to Unix timestamp | 
| EnvCount | Return the number of environment variables | 
| EnvStr | Return environment variable by index | 
| Exec | Execute another program, and wait for it to finish. | 
| FExpand | Expand a relative path to an absolute path | 
| FindClose | Dispose resources allocated by a FindFirst /FindNext  sequence. | 
| FindFirst | Start search for one or more files. | 
| FindNext | Find next matching file after FindFirst | 
| FSearch | Search a file in searchpath | 
| FSplit | Split a full-path filename in parts. | 
| GetCBreak | Get control-Break flag | 
| GetDate | Get the current date | 
| GetEnv | Get environment variable by name. | 
| GetFAttr | Get file attributes | 
| GetFTime | Get file last modification time. | 
| GetIntVec | Get interrupt vector | 
| GetLongName | Get the long filename of a DOS 8.3 filename. | 
| GetMsCount | Number of milliseconds since a starting point. | 
| GetShortName | Get the short (8.3) filename of a long filename. | 
| GetTime | Return the current time | 
| GetVerify | Get verify flag | 
| Intr | Execute interrupt | 
| Keep | Terminate and stay resident. | 
| MSDos | Execute MS-DOS system call | 
| PackTime | Pack DateTime value to a packed-time format. | 
| SetCBreak | Set Control-Break flag status | 
| SetDate | Set system date | 
| SetFAttr | Set file attributes | 
| SetFTime | Set file modification time. | 
| SetIntVec | Set interrupt vector | 
| SetTime | Set system time | 
| SetVerify | Set verify flag | 
| SwapVectors | Swap interrupt vectors | 
| UnixDateToDt | Convert a Unix timestamp to a DateTime record | 
| UnpackTime | Unpack packed file time to a DateTime value | 
| weekday | Return the day of the week |