[Glass] What is GemStone's Monticello cache repository?

I wanted to make sure I don't have some .mcz of my app around my server and I went to check the Monticello cache. In Pharo, the default cache is a directory repository (under 'package-cache' directory). However, in the server I didn't find any .mzc around (which is good for me!). However, I can browse the 'cache' repository from the Monticello tool in GemStone and see the cache etc...so what type is that repository? where is the cache stored? Inside GemStone itself?  Indeed, it looks it uses an instance of MCDictionaryRepository which is likely stored in a symbol list. But just to be sure.....

Thanks!

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Mariano
http://marianopeck.wordpress.com