Features of *ENSTEMP

ENSTEMP was addressed already some time ago; 
Article: Preventing Globals From Getting Journaled (Continued from How do I Minimize My Journals)

and is also in public documentation
Where InterSystems IRIS Stores Temporary Production Data

Though I'd like to understand if this is just naming a non-journaled DB
or are there also typical features of CACHETEMP / IRISTEMP related to it:

• automatic clean-up at system startup 
• keeping Global Buffers in memory as long as possible
• late writing to the storage file 

In other words is it a 2nd, 3rd, .. fully feature blown IRISTEMP  ?