PID

Process ID for the process running Vocalizer.

Value	Any character string
Default	OS-defined process ID for the process running Vocalizer.
How to set	Shown in precedence order (see Configuration precedence): Set in an environment variable. Set in a Vocalizer configuration file (tts_config.xml).
Use	Seldom used.

By default, Vocalizer is configured to be safe for use within multiple processes on the same machine. If you enable log files and are using Vocalizer within multiple processes on the same machine, add ${PID} into the log file paths when you change the default configuration.

Vocalizer first looks for an override within the XML configuration file, then an environment variable with the same name, then uses the process ID defined by the operating system.