Process parameters allow you to control the run by specifying the equation/physics to be solved, define control parameters such as convergence tolerances, number of iterations/time steps, etc. For detailed information about the parameters, see Process Parameters in the HyperXtrude help.
The tabbed interface includes options for the session, friction stir welding specifications, advanced settings, user commands and transient data.
The parameters on the Session tab may be modified by the Create Mesh macro.
The User Commands tab accepts commands for both a header and footer. The header commands contain the information that will be sourced before the .grf file, usually contained in a .tcl file.
Friction Stir Welding User's Guide