[Dovecot] LDA vs LMTP index files

[l...@airstreamcomm.net]

In the docs it states that LDA " ...takes mail from anMTAand delivers it 
to a user's mailbox, while keeping Dovecot index files up to date."  I 
am wondering if LMTP also interacts with the Dovecot index files and 
keeps them up to date?