The Run Solver panel in MotionView allows you to run MotionSolve directly from MotionView.  The Run Solver panel allows you to either run the current model or run an existing MotionSolve command file generated previously by MotionView.  From the MotionView Solver Mode menu, select MotionSolve to make MotionSolve the current solver.

Run Solver panel with the MotionSolve solver selected.

Run Solver panel with the Run MotionSolve file option selected.

For more information on the Run Solver panel options, see Run Solver Panel - MotionSolve in the MotionView User's Guide.