Automating certain behaviors, such as hitbox adjustments or "aim" assistance.

While some forums claim these DLLs are merely "hitbox fixes" to improve registration, Valve’s Anti-Cheat (VAC) treats any third-party DLL injection that provides a competitive advantage as a bannable offense. Portable CS 1.6: Convenience vs. Security

Overwrite the game's standard input to fire automatically or stabilize recoil.

In many "Portable" or "Non-Steam" versions of the game, custom DLLs are used to: