Interapplication Communication for UNIX
PV‑WAVE provides a variety of methods for interapplication communication under UNIX. For example:
PV‑WAVE can execute external programs and exchange data with them. Depending on the method used, the exchange of data can be unidirectional (one-way) or bidirectional (two-way). External programs can call PV‑WAVE to perform graphics, data manipulation, and other functions. Again, depending on the method used, the communication can be unidirectional or bidirectional. 
