URLs are sometimes redirected to advertisement pages by URL redirection. For more flexible URL rewriting and redirection, Apache mod rewrite can be used. Modern thin clients address this limitation via port mapping or USB redirection software. Sharing is performed on demand, including pointer redirection communication between main system and graphics subsystem. Its syntax simplifies I/O redirection. Several different kinds of response to the browser will result in a redirection. The exec command can also perform a redirection. The shell-style codice 1 syntax is often retained, despite not being used for input redirection. For this reason the PXE standard developed the concept of DHCP redirection or "proxyDHCP". The QNX kernel, codice 1, contains only CPU scheduling, interprocess communication, interrupt redirection and timers. A loop device may allow some kind of data elaboration during this redirection. This may allow the redirection of users to different content on the web. This provides the interfaces of piping, filters and redirection. These emphasize redirection and manipulation rather than strength. Personal numbers are used as redirection IDs.