The resident protection can also scan the programs being run, OLE documents opened with the help of the OLE functions and boot sectors of the diskettes inserted.
If you insert a diskette into the drive, then at the first access to it the program will check the boot sector, whether or not it contains a virus. If it finds a virus, it will display a warning message . You can continue to work with the diskette, because for a virus to become active it has to be started-up first, which occurs in case of a boot virus only at the booting of the system. The purpose of the warning message is to advise you of threatening danger.
The warning message will also be displayed, if a known virus has been discovered in an executable program, or if the user attempted to open an OLE document containing a virus. If you click on the "OK" button, you can continue your work, but the access to the infected will be denied, so it will prevent the infection of your computer.