May I know what's the use of custom session in
system->preferences where it will be used?

Select yes to customise session related values.

i s'pose a good example would be if u were running multiple sites on the same server/domain.

a custom session would then be used to seperate the session names from the other sites by using a different session name for each site.

I'm using "Tiny Content" module as for my starting page, it works properly in the administrator account,but when anonymous user view the page it doesn't show the content of the page instead it show the user profile. In the system->anonymous I had checked Block Access Rights and I did not checked Module Access Rights so they will not see the Tiny Content in the Main Menu.

Another one, is when is checked Module Access Rights and Block Access Rights for Anonymous users it works properly but Anonymous user have already access to the Module. What can I do to fixed this?