They provide useful and attractive appearance (RollableKnob-like and Speedometer-like control)Controls that can easily be integrated into any applications but mainly they were intended for industrial-process related application
This free Software includes two Delphi Controls (VCL)
- TKnob
- TMeter
so before you can use them, you must install them first in your Delphi IDE, you can read the online help to accomplish the installation process
These VLCs was written in Delphi 3 and it might need (I haven't tried it yet) some adjustments, and it would be relatively easy.