Sorry if this is trivial, but I am still learning the basics of PAAS, so I appreciate your patience...
I think they can, but I'm not certain, and want to make sure...
In particular, I want to host both a Wordpress blog (whose PHP needs Apache) & a Java WAR webApp (with servlets needing Tomcat); each served for different domains. So these would be independent websites.
I was initially planning to do all of this with a traditional web hosting provider, but have realized I can probably achieve the same with a PAAS for cheaper & simpler.
Thanks!
I found out myself with OpenShift that the answer is Yes to both questions 1. & 2. I hosted a Wordpress and a .war on separate domains on the same OpenShift account (each on a separate Wordpress gear).