The Setup Library provided as integral part of  LizaJet Installer contains functions like:

• Check that a Service is running,
• starting and stopping services
• Register  COM and ActiveX
• Check that an executable is running
• Execute programs or Windows Shell objects.
• Check if files and folders exist
• Create files, folders and paths
• Determine system configuration such as Memory size, CPU Speed, Screen resolution and Color depth
• Access Registry, to view and modify keys and values
• Access and modify environment variables

You can reach all those functions using Object Pascal calls.