rv = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &hContext);

static extern int SCardEstablishContext(uint dwScope, IntPtr pvReserved1, IntPtr pvReserved2, out IntPtr phContext);

Public Shared Function SCardEstablishContext(dwScope as UInteger, pvReserved1 as IntPtr,  pvReserved2 as IntPtr, <out>() phContext as IntPtr) As Integer

    static extern int SCardEstablishContext(uint dwScope,

        ret = SCardEstablishContext(2, IntPtr.Zero, IntPtr.Zero, out hContext);

    /// <param name="hContext">A handle that identifies the resource manager context. The resource manager context is set by a previous call to the SCardEstablishContext function.</param>

ret = SCardEstablishContext(SCARD_SCOPE_USER,IntPtr.Zero,IntPtr.Zero,out hContext);

// Paste here code for SCardEstablishContext, SCardConnect