The Interdimensional Communicator is an ad hoc device put together by Winston Zeddemore to communicate with other dimensions in order to find the other Ghostbusters.
After Egon Spengler, Ray Stantz, and Peter Venkman were transported to another dimension, conventional communication was rendered useless. Utilizing some communication equipment, Winston quickly put together a device to find the guys. Once Slimer made some final connections with Ecto-1, they began their search. However, it quickly became a fruitless search. By luck, when Slimer's tail crossed into the machine, they picked up Peter and Egon. The Ghostbusters collaborated and concluded on a way to escape Boo York.
- On page 18 of Ghostbusters Volume 2 Issue #1, the Interdimensional Communicator makes a non-canon cameo on the filing cabinet to the right of Peter's office.