Synchronization with atomic time servers (NIST) via the internet.

However, if you are looking for a "fix" because the software keeps asking for registration, the reality is that the software is effectively "Abandonware." Using it on modern systems isn't just a security risk; it’s often a functional headache. Modern (and Safer) Alternatives

A lightweight, simple utility that handles multiple alarms and wakes your computer from sleep mode.

Version 6.0 was designed for Windows XP, Vista, and 7. Trying to force a "fixed" version onto Windows 10 or 11 often leads to system tray glitches or Explorer.exe crashes.

If you just want to customize the look of your Windows 11 clock (especially on secondary monitors), this is the gold standard. It’s open-source and highly customizable.