This environment variable specifies the file to which log messages are directed.
filespec is a filename. The exact syntax is platform specific.
Use this environment variable to specify a log file other than the
default. If NSPR_LOG_FILE is not in the environment, then log output
is written to
stderr, depending on the platform. Set
NSPR_LOG_FILE to the name of the log file you want to use. NSPR
logging, when enabled, writes to the file named in this environment
For MS Windows systems, you can set NSPR_LOG_FILE to the special
WinDebug. This value causes logging output to
be written using the Windows function
writes to the debugger window.