Answer:
In order to evaluate user-defined points in addition to the result values on grid points and FE mesh nodes, there is the option to specify "Additional Surface Result Points" in RFEM 6. You can find them under "Types for Surfaces", as shown in Image 01.
The coordinates for these points are entered directly in the dialog box or selected in the model; see Image 02. Furthermore, it is necessary to assign the surface whose result values should be displayed.
In the Results navigator (the upper half), you can activate and deactivate the display of the manually specified result values. In the lower half of the Results navigator, you can set the display for grid points and/or surface result points; see Image 03.
When displaying the values in FE mesh points, the additional surface result points are deactivated.