| API Control | 
|---|
| ApplyKey | Apply a new license key. The previously applied key will be replaced with LicenseKey. | 
| Port Enumeration | 
|---|
| EnumPhysical | Refreshes information about physical serial ports (or third-party virtual serial ports) and returns their number. | 
| EnumVirtual | Refreshes information about virtual serial ports and returns their number. | 
| GetPhysical | Retrieves the name of physical serial port by index. | 
| GetVirtual | Retrieves virtual serial port name by index. | 
| Creating and Removing Ports | 
|---|
| CreatePort | Creates virtual serial port with non-standard name. | 
| CreatePortEx | Creates virtual serial port with non-standard name and allows replacing the value of FriendlyName and CompanyName (indicated by the license key) with alternative values. | 
| CreatePortOverlapped | Creates virtual serial port with non-standard name over existing COM port. | 
| CreatePortOverlappedEx | Creates virtual serial port with non-standard name over existing COM port and allows replacing the value of FriendlyName and CompanyName (indicated by the license key) with alternative values. | 
| CreateTwinPort | Creates virtual serial port twin with non-standard name. | 
| CreateTwinPortEx | Creates virtual serial port twin with non-standard name and allows replacing the value of FriendlyName and CompanyName (indicated by the license key) with alternative values. | 
| RemovePort | Removes a virtual serial port with non-standard name. | 
| Other | 
|---|
| GetLastError | Returns last error code for the latest operation. |