(Sorry, but I'm not going to write this unless someone actually uses this feature. Let me know.)
This functionality is available only if the `--enable-ipc' option
was specified to configure during installation of Web2c
(see section Installation).
If you define IPC_DEBUG before compilation (e.g., with `make
XCFLAGS=-DIPC_DEBUG'), TeX will print messages to standard error
about its socket operations. This may be helpful if you are, well,
debugging.
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