Good afternoon Jan, My name is Jose and I am developing a tool for my company which analyses every USB device plugged to the system and if it doesn't fulfill some. The light blinks faintly about once a second. It is slowly driving me insane. How do I find out which program is causing this, so I can disable it? Acer 5274 laptop. I have used both device interfaces and symbolic links and quite frankly I do not see any advantages to using device interfaces. They are cumbersome for the user. Has your USB stick been properly inserted, or has it been removed? A bit of VB code will resolve that question for you. Home USB Central The HID Page. The HID Page. For developers of USB devices in the human interface device (HID) class. Basics | Tools | My example code | Other. At first sight, USB device control can seem like a dark art only practised by initiated gurus, but in this article, Ashley Deakin hopes to show you the light. USB RS232 - FTDI designs and supplies USB semiconductor devices with Legacy support including royalty-free drivers. Application areas include USB RS232, ( USB Serial. Hi, I get a problem that the RegisterDeviceNotification() returns NULL all the way in execution. here i list my code snippnet: HidD_GetHidGuid(&m_guidHID); Copyright © 2010 Future Technology Devices International Limited 3 Document Reference No.: FT_000328 How to Detect the Connection and Removal of USB Devices on a System // Component to detect when usb devices are connected or disconnected // using RegisterDeviceNotification unit U_Usb; interface uses Windows, Messages, SysUtils.