The following table summarizes the MCI system commands. These commands are interpreted directly by MCI. System commands also support notify and wait as optional flags. You can add either or both of these flags to any system command.
| Command | Arguments |
| break device_name | {off | on virtual key code} | |
| sound sound_name, | ||
| sysinfo device_name | {installname | name index | name index open | quantity | quantity open} | |