If you carry around a USB drive, or any device with USB storage (for example, your phone), you should be running PortableApps. PortableApps is a menu of applications you like to take with you. Visit www.portableapps.com if you have not already loaded up your USB drive.
Today, however, I wanted to take a moment to sing the praises of HFS, the HTTP File Server. You can find it at http://rejetto.com/hfs. HFS is a very small (560KB) single file HTTP file server. Do you need to quickly move a file from your PC to another PC or your tablet? Fire up HFS and in a few moments you will have a file server running on your computer from which you can download files. I use it to move files from my laptop to my tablet.
HFS is freeware, with no ads. It has 5 stars from CNET and Softpedia. You can make a donation, via PayPal. I did, and recommend that you do the same.
thank you very much Alan, your words are encouraging