NCSA Mosaic 2.0 and earlier allows local users to cause a denial of service ("remote control" outage) by creating a /tmp/xmosaic.pid file for every possible PID.
NCSA Mosaic 2.1 through 2.7b5 allows local users to cause a denial of service ("remote control" outage) by creating a /tmp/Mosaic.pid file for every possible PID.