I'll have to look into the web-server customizations. One of them has a custom Apache module for talking to a 3rd party mainframe, but that should theoretically be movable too (if it's the correct platform architecture).

Of course, an Apache module's just C code, so how hard could it be to port to another architecture? But in all seriousness, I suspect it's a relatively simple UDP socket communication interface, so it is probably portable.

Thanks for the mention of Wordpress. It is a similar architecture. I'll read up on how to move a Wordpress install, and use that as a model for testing one of these apps.