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A bit of background information: Inorder to read/write to SLE4442 memory cards, my app is currently using an Omnikey Cardman 3021 USB card reader, a Sumbsembly Smartcard API (external dll) which is capable of wrapping CT-API calls (directed to omnikey's dll) so that I can read/write the memory card in my c# app. The only problem here is that Omnikey only provides a 32-bit dll of their CT-API. I asked if they are going to produce a 64-bit version, but they couldn't be bothered. Current situation: Inorder to make my application 64-bit capable, I must rewrite it using Windows WinSCard API. The problem here is that there are no specific examples on the web how to do it. Also getting hold of working APDU commands is nearly impossible, but I've managed to aquire two slightly different versions that sort of work. I have googled this a hundred times over many months and with what I have managed to gobble together I can finally read the SLE4442 memory card. But for the life of me I can't get writing to work. The code: I'm not going to post the entire code into this first post (if need be I can do it later or provide a link to the source code). But I'll outline the basic steps. 1) SCardEstablishContext 2) Get the reader name via SCardListReaders 3) SCardConnect 4) Read entire memory with SCardTransmit and APDU new byte[] { 0xFF, 0xB0, 0, 0, 0 }; 5) Verify pin with SCardTransmit and APDU new byte[] { 0xFF, 0x20, 0, 0, 3, 0xFF, 0xFF, 0xFF }; (Note that this does return 0x90;0x00 as a response, which means the verification should have been succesful) 6) Try to write with ScardTransmit and APDU new byte[] { 0xFF, 0xD6, 0, 0, 50, 1 }; (try to write value 1 at memory position 50) - I have also tried using an APDU with the first parameter being 0x00 and/or the second byte being 0xD0. The response has never been 0x90;0x00 so I assume there is an error during writing, but I haven't been ab

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