Multisite CI installations - HOW TO

[eluser]Zeeshan Rasool[/eluser]
[quote author="cold_fusion" date="1272310529"]
I only have 1GB of my hosting package and only 140 mb left, so i dont want to:

- waste my disk space
- update CI individually (i update only one CI installation instead)
- i do want to share some resources (libraries, etc.)
from the main codebase

I think those are good enough reasons for having this arranged in such way, don't you?[/quote]

I think, You can do this, but not confirmed about calling CI classes on sub-domains. Make it a try. Put your CI installation on domain an use absolute paths to get CI system folder.
for this put separate index.php file in each sub-domains with application folder and give absolute static path to system folder.

sub2.mysite.com = index.php+application // set sstem folder path with absolute path
sub3.mysite.com = index.php+application // set sstem folder path with absolute path
sub4.mysite.com = index.php+application // set sstem folder path with absolute path