It depends on whether you specifically mean an RPI, or just a roleplaying-intensive MUD. An RPI is a roleplaying-intensive MUD (as of course that's what it stands for), but not all roleplaying-intensive MUDs are RPIs - "RPI" has a more specific meaning than that of its acronym, much like many other acronyms (for example not every Object-Oriented MUD is a MOO, even though that's what "MOO" stands for).
An RPI has various criteria, include no OOC channels or who list, enforced roleplaying, short descriptions instead of character names, no levels, etc.
A roleplaying-intensive mud has only the criteria defined by its name - that it should involve intensive roleplaying.
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