How to detect access control machine in or out?
<p>I have different types of access machines like fingerprint scanner, card scanner, etc. These machines generate a data when used like card_no:punch_time.</p>

<p>I am developing an app in C#.NET to manage these access. Employees scan their cards while in and out. They have 3 or more different working shifts. But I have a problem with how do I detect if they are entering or leaving without using any hardware?</p>

<p>Can anybody help me?</p>
