The user might define his own functions to manipulate the mesh or the results with the user function stored in file ”userFunction.c”. See the command ”call” how to call a user function. The user can generate new nodes, elements or datasets or extend or manipulate existing datasets or interfaces to other software. The file ”userFunction.c” includes an example which calculates the hydrostatic stress and stores the result in a new dataset. There the user can see how to deal with datasets. In case the user has no access to a compiler he may solve his task by using the in build command language. The section “User File Parser” can be used as an example.