Consts
| Scope | Name | Type | Value | Description |
| Private | FILE_ATTRIBUTE_NORMAL | Long | &H80 | |
| Private | FILE_SHARE_READ | Long | &H1 | |
| Private | FILE_SHARE_WRITE | Long | &H2 | |
| Private | FirstComPort | Long | 1 | |
| Private | INVALID_HANDLE_VALUE | Long | -1 | |
| Private | LastComPort | Long | 16 | |
| Private | OPEN_ALWAYS | Long | &H4 | |
| Private | OPEN_EXISTING | Long | &H3 |