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USBH CDC ACM Virtual Com Port Question

In Keil's Run Time Environment

I will only use USB Port
I use it as virtual com.

When I coding USB Host Virtual com
as usbh cdc acm, usart port included, why??

//////////////////////////
extern ARM_DRIVER_USART Driver_USART9;
#define ptrUART_USB (&Driver_USART9)
////////////////////////

In keil's "manage run time environment" configure
mcu : stm32f207vc
CMSIS : core
RTOS : Keil RTX
CMSIS Driver : USART(API) : CDC, USART
USB Host(API) : Full Speed
Device : CStartup, classic
Device : common,Cortex,DMA,GPIO,RCC
USB : Host :CDC