Abstract: In one embodiment, a system for measuring subjective user reaction concerning a particular web page comprising an embedded document includes a first icon viewable on the particular web page independent of input from a user subsequent to the user accessing the particular web page. The particular web page includes a document embedded in the particular web page. The first icon solicits a subjective user reaction to the particular web page comprising the document embedded in the particular web page from the user independent of input from the user subsequent to the user accessing the particular web page. The first icon receives user input indicating a desire to provide a subjective user reaction to the particular web page including the document embedded in the particular web page. The user input causes a second icon to become viewable on the particular web page.

Abstract: A downhole tool for providing a thrust force to an elongate body extending in a borehole formed in an earth formation is provided. The tool comprises at least one rotatable body provided with a plurality of rollers, each roller being expandable against the borehole wall at a selected contact force between the roller and the borehole wall. The rollers are oriented when expanded against the borehole wall so as to roll along a helical path on the borehole wall, and a motor is provided to rotate each rotatable body. The tool further comprises a device to measure the thrust force provided by the tool and a control system to control the thrust force provided by the tool by regulating the rotative torque of the rotatable body, in response to the measured thrust force.