This includes finished OPL programs. Ram SSDs are for storing or backing up information which changes frequently. This includes OPL programs you are still writing or testing. You can, though, save programs and data files to either kind of SSD, as you see fit. Your OPL programs can create or use data files on SSDs.
Logical names are unaffected by which drive a data file is on.
The internal memory and SSDs use a DOS-compatible directory structure, the same as that used by disks on business PCs.