nobrain,
I think it's initially based on hard drive space. We just received 14 gateway 1.8GHz computers with 80GB hard drives. The TIF was set to a ridiculous 960 MB. Since we have a T1, I changed it to 20MB.
I agree with DaDogg and have posted here many times with my suggestions. They are:
choose a reasonable size for the temporary internet files directory. i'd suggest 40MB for a 56K connection, as little as 10MB for cable or DSL.
It's a very good idea to look in DOS, as I've had computers that have had over 100 directories of history, each containing and index.dat file of around 400KB (average)
The only way I became aware of this was by running an old DOS program called Dosshell. it's very easy to navigate and you can even setup your mouse, using the dosstart.bat file, to drag and drop files.
You can downlad Dosshell here. I think you'll make some intersting discoveries:
Dosshell, for locating those hidden files. Place all files in c:\windows\command
Then shutdown, choose restart in MS-DOS mode and type doshhell at the command prompt.
reghakr