Updating free sites

[neveremail]

Hi,

I know many TGPs will blacklist you if you change your gallery pages after submission.

But I was wondering what the stance is by free sites.

I want to leave them as they are after submission but if I see a sp error or want to change a banner or sponser codes because the sponser is dead/changed can I do this??

What is it that these scripts that check for page changes use - do they simply use the date last modified or do they check for changes by comparing to thier own cache of the page??