I think what you have to remember is that USB devices are mostly 'seen' by Windows so to read from a RAM Stick you just need to access it as you would any other 'drive'.
If you are talking about general serial comms, then Com port driver components will not 'see' a usb port because its not a comms port.
The 2 easy ways round this are.
A Windows driver that links to the USB bus and Widows then sees it as a serial port. e.g as provided by DLP design.
Your Delphi Comms component will then see this as another port.
A hardware dongle that converts USB to serial (we supply this with a gas generator monitoring application for case where the user has a laptop with no serial ports.
(in fact this is the same thing as the previous item, but the driver is 'in' the dongle so there is no need for an install.)
The third (not so easy) way is to write your own drivers (follow Nordlund's links ??)
Multi Ports Sniffer for COM LPT USB. v.3.0.2
By Alexey Zaharov. The best tool for doing LPT, COM and USB port's data transfer logging. Using this tool you can simply do monitoring and spying data transffered through ports. This is useful for people who want to research any additional HW connected to port like mobile phones.
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