This function allows the user to trace the elements/nodes in the model
from the FLD window. The user moves the
cursor to a point in the FLD window to highlight the corresponding elements in
the model. Click the left mouse button to stop the tracing and the program will
label the corresponding element and node numbers in the lower right corner of
the screen state bar. At the same time, the first and second principal strain
values display on the screen state bar.