The SCANLAB RTC4 Real-Time Scan-System Controller is a hardware controller used primarily in laser scanning systems, such as those found in laser engraving, laser marking, or other industrial applications. The RTC4 controls the movement and operation of a laser scanning head, providing real-time control of the scanning process for high precision. The Windows driver for the RTC4 enables the system to communicate with a computer running Windows, allowing software to control the laser and the scanning hardware.