Working with files

hi everyone,
i have a problem, i have one app which calls another java app using runtime functions.
Ok the thing is that i need that one app will write in a file and the other one read and delete the lines read from the same file almost in a syncrhonous way, it means, both app use the same file but in different ways, anyone knows how to do it?
Also I though it could be done with pipes but even not a clue. Thanks

Under Unix there are named pipes. A named pipe is in the file system, hence it can be opened as a file. The reader is blocked until data is there to read or the writer is blocked until there is a reader to read the data. Once data is read, it is gone.

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