parametric command line interface to CAD FEA, parametric analysis with CAD
You can use Parametric command line interface if you use programming language or environment that does not support Parametric Object Interface to QuickField.
Also, even for programming languages that support COM, using the command line interface could be easier. All you should know is how to execute external program (.exe file) with command line parameters in your program.
There is a special program QLMCall.exe in the LabelMover installation directory. To control LabelMover you just should execute QLMCall.exe with variation values (or additional commands) as parameters.