System administrators can configure Windows Update to install critical updates automatically so long as the computer has an Internet mobile connection, without the user needing to install them manually, or even be aware that an update is required.
Windows Vista and later provide a Control Panel to configure update settings and check for updates.
Microsoft routinely releases security updates on the second Tuesday of each month (Patch Tuesday), but can provide them whenever a new update is urgently required to prevent a newly discovered or prevalent exploit targeting Windows users.
I have been using WSUS for the last two years at home and in many enterprise environments. For most of the base operating systems and products the installers for Service Packs are provided as separate downloads or as slipstreamed installation discs.
Another alternative is using IPCop In short, Auto Patcher combines the advantage of both Windows Update (presentation and description of updates and automated installation), and the special administrative updates (portability and installation without the need of an Internet connection).
When being connected to the Internet, select the " install without an option to install it on additional Windows98 systems.
I got now a copy of Windows98, both at work and at home.