Author: Christian.Queinnec@lip6.fr

## Summary

This chapter presented the main system interface functions provided by the `Unix` module. Despite of its name, the module offers a large number of functions which can be used under Windows as well (see figure 18.1).
In the area of process creation, we did concentrate on the possibilities of communication between several Objective CAML programs running at the same time on the same machine. Operations handling lower level file access, signals and communication pipes have been discussed in detail.