i have implemented a manufacturing plant floor data system to track work flow through the plant. currently i have employees logging in to a PC by typing in their employee number. I would like to upgrade this and add a touch less proximity card reader so the employee can log in using a card. Has anyone had experience with prox card readers (good/bad) and can you recommend a brand that you've had success with that includes sample VB6 code and a dll for VB6.

Thanks in advance for any help.