To successfully use CLEO and FLA on v2.00, your game directory typically needs these components: CLEO Scripts

Typical workflows for modders

I believe you're asking about for GTA San Andreas v2.00 , specifically those that use FLA (a tool for creating CLEO scripts) and their long-running features (loops, timers, background processes).

Adding a first-person mode, changing weather, or spawning any vehicle instantly.

The GTA SA modding community is active and passionate, with numerous resources available: