In Visitor3/4 and buldozer it is possible to name the namedPipe with the "-connect=pipe\anyNameYouLike" command (https://community.bistudio.com/wiki/Visitor_3_Manual#Installation_.26_Setup).
In Terrain Builder this commandline is ignored and a generic "-connect" command is appended to the exec line of buldozer.
The command looks in most cases like "P:\buldozer.exe -buldozer -name=Buldozer -window -exThreads=0 -cfg=p:\buldozer.cfg -connect=pipe\B0B2A,8EDB".
Inspecting all open pipes show only one namedPipe without name for buldozer and terrain builder. This pipe can't be accessed from third party programs.
Can't say if this is a bug or was intended while developing TB/Addonbuilder out of V3/O²