Every device responds to the capability (MCI_GETDEVCAPS), status (MCI_STATUS), and info (MCI_INFO) commands. These commands obtain information about the device. For example, the following command returns "true" if a cdaudio device can eject the disc:
mciSendString(
"capability cdaudio can eject",
lpszReturnString, lstrlen(lpszReturnString), NULL);
The flags listed for the required and basic commands provide a minimum amount of information about a device. Many devices supplement the required and basic commands with extended flags to provide additional information about the device.