A first gain stage and a second gain stage having different gains are linked in cascade to construct a wide range and high resolution programmable gain amplifier. The indicium may include at least one of a variously oriented indicium and a variously positioned indicium for indicating the orientation of each carpet tile in an installation. In order to save data collected by the applet before the popup window is closed, a control container embedded in the popup window disables the close window button of the popup window. Finally, the system uses the jump target returned by the lookup as a predicted jump target for the jump instruction.