The following table shows the Smart Card Services structures with a description of the purpose of each.
| Programming element | Description |
|---|---|
| SCARD_IO_REQUEST | This structure begins a protocol control information structure. |
| SCARD_READERSTATE | This structure is used by functions for tracking smart cards within readers. |
| SCARD_ATRMASK | This structure is used by the SCardLocateCardsByATR function to locate cards. |
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