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The following functions connect to and communicate with a specific smart card. I/O operations to the card use a buffer for sending or receiving data and a structure that contains protocol control information. The protocol control information structure always begins with an SCARD_IO_REQUEST structure.
| Topic | Description |
|---|---|
| SCardConnect | Connect to a card. |
| SCardReconnect | Reestablish a connection. |
| SCardDisconnect | Terminate a connection. |
| SCardBeginTransaction | Start a transaction, blocking other applications from accessing a card. |
| SCardEndTransaction | End a transaction, allowing other applications to access a card. |
| SCardStatus | Provide the current status of the reader. |
| SCardTransmit | Requests service and receives data back from a card using T=0, T=1, and raw protocols. |