Changing PHP-CGI to PHP Apache

If I click the box to change from PHP-CGI to PHP Apache, will this screw up any of my existing forums that are running?

I can’t run a certain htaccess file/phpscript with PHP-CGI and I want to change just to run this thing for a week or so and then change back

I just looked at my prefs for this and the box for running as PHP-CGI is NOT checked.

Does this mean my domain is already running PHP under Apache and is not PHP-CGI?

probably. If you have been a DH user for a while, your site is running as Apache unless you have either checked the box or changed it with htaccess