In the late 1970s, the IBM 3730, a word-processing variant of the IBM 3790 was announced. It used 3790 hardware but its software made it a dedicated shared-logic word-processing system which could support a dozen or more word-processing IBM 3732 terminals.
It could be connected using Systems Network Architecture to a central mainframe running IBM DISOSS which was a centralized document exchange software running on CICS.
References
IBM 3730 Wikipedia(Text) CC BY-SA