That depends on the methodology used to obtain the updates.
If you use Windows Update (v4 for Windows 98 systems), then the updates are
downloaded -and- installed as one single process.
If you use Automatic Updates to detect the updates, but you download them on
demand, then the process is two manual steps, and you must also initiate the
installation of the updates after the download completes.
If you use Automatic Updates to download the updates automatically, then the
installation is a single step process, initiated when you respond to the
notification from AU that the updates are downloaded and ready for
installation.
If you use Automatic Updates to download -and- install the updates
automatically, then the process is two steps, the first to download, the
second the installation at the scheduled time; but both steps are performed
"behind the scenes" and you need not be aware of the process at all - unless
something goes wrong.
To answer your second question, once you "install" the updates, the new files
overwrite the original files, most likely they're stored in %windir%\system32,
but may also be in other folders, as necessary. The -old- files are copied to
a hidden folder in the Windows directory, where they are 'stored' in case you
need to uninstall the applied update.
"B Eve" <> wrote in message
news

6D73112-09ED-4C73-A47B-...
> This may sound like an idiotic question, but once you've downloaded the
> "critical updates" are they automatically installed? The reason I ask is
> because once I install updates, I don't know where they end up??? Thank you
>
> "Lawrence Garvin [MVP]" wrote:
>
>> There used to be a Security Update CD for Windows 98, and you may be able
>> to
>> find a copy of it from alternative sources, but I wouldn't put a lot of
>> effort
>> into doing so, because it's probably significantly out of date now.
>>
>> You can build your own 'update' CD, by downloading all needed updates, and
>> writing a script to run from the CDROM. Use the SUPPRESSREBOOT option of
>> the
>> updates to allow the installation of updates with a single reboot.
>>
>> Some applications, such as IE6, Office, Media Player, must be installed as
>> separate processes.
>>
>> "pulak das" <> wrote in message
>> news:AB3C4AFF-B7C8-4F58-A6CE-...
>> > (1) I wanted to know, is there any service pack CD (may be 3rd party
>> > also)
>> > available in the market, thru which we can apply all the patches of
>> > windows
>> > 98 SE, in a single shot with reboot only at end. Applying downloaded
>> > patches
>> > of windows 98, one by one, takes much time, secondly, after applying
>> > patch,
>> > it asks for reboot. So is there any way, by which all the patches can be
>> > applied in a single run. (2) Together with win98, can other patches of
>> > like
>> > IE 6.0 SP1, office 2000 sp1 & sp3, outlook sp1 etc can be bundled
>> > alongwith
>> > win 98 patches ?
>>
>>
>>