$config['index_page'] to always include ?

[eluser]escape[/eluser]
I've encountered the IIS situation where it is necessary to include a question mark when defining the index_page (i.e., $config['index_page'] = index.php?).

Including the question mark on Apache installations doesn't seem to change the operation of my program. I would like to know if setting $config['index_page'] = index.php?, as a permanent configuration variable, will pose any problems.

Thanks,
cw