Introduction - If you have any usage issues, please Google them yourself
OMNIKEY Synchronous API
SOURCE + LIB + DLL + DOC (PDF)
This API consists of one DLL (scardsyn.dll) which provides functions for
2 wire bus protocol cards (like SLE4432 and SLE4442)
3 wire bus protocol cards (like SLE4418 and SLE4428)
I2C bus protocol cards
Data flash cards: AT45DB041B card
Contactless cards: HID iClass Cards
Secure memory cards: AT88SC153, AT88SC1608, AT88SC101, AT88SC102