vc中，winmm.lib是作什么用的

VC调用winmm.dll(有关多媒体的动态连接库)的接口。其中有以下API函数：
CloseDriver
DefDriverProc
DriverCallback
DrvGetModuleHandle
GetDriverModuleHandle
MigrateAllDrivers
MigrateMidiUser
MigrateSoundEvents
NotifyCallbackData
OpenDriver
PlaySound
PlaySoundA
PlaySoundW
SendDriverMessage
WOW32DriverCallback
WOW32ResolveMultiMediaHandle
WOWAppExit
aux32Message
auxGetDevCapsA
auxGetDevCapsW
auxGetNumDevs
auxGetVolume
auxOutMessage
auxSetVolume
joy32Message
joyConfigChanged
joyGetDevCapsA
joyGetDevCapsW
joyGetNumDevs
joyGetPos
joyGetPosEx
joyGetThreshold
joyReleaseCapture
joySetCapture
joySetThreshold
mci32Message
mciDriverNotify
mciDriverYield
mciExecute
mciFreeCommandResource
mciGetCreatorTask