3.1.4.31 SCARD_IOCTL_BEGINTRANSACTION (IOCTL 0x000900BC)
The Begin Transaction method locks a smart card reader for exclusive access for the specified smart card reader handle. If the caller is unable to receive exclusive access, this call MUST block until the request can be met.
Return Values: The method sets Long_Return.ReturnCode (for more information, see section 2.2.3.3) to SCARD_S_SUCCESS on success; otherwise, it sets one of the smart card-specific errors or one of the return codes from Winerror.h. No specialized error codes are associated with this method.