The FORM specifier asks whether a file is connected for binary (WNT, W9*), formatted, or unformatted data transfer. It takes the following form:
| 'FORMATTED' | If the file is connected for formatted data transfer |
| 'UNFORMATTED' | If the file is connected for unformatted data transfer |
| 'BINARY' | If the file is connected for binary data transfer |
| 'UNDEFINED' | If the file is not connected |