126.96.36.199 SCARD_IOCTL_ISVALIDCONTEXT (IOCTL 0x0009001C)
Is Valid Context checks if a previously established Smart Cards for Windows context from SCARD_IOCTL_ESTABLISHCONTEXT is still valid. For this call to succeed, Context_Call.Context (for more information, see section 188.8.131.52) MUST exist in rgSCardContextList and the Smart Cards for Windows communication channel MUST still be present.
Return Values: This method sets Long_Return.ReturnCode (for more information, see section 184.108.40.206) 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.