This is a Perl module for running multiple cleartool commands in a single process space for speed. The speedup depends on the types of cleartool operations you're doing but typically seems to be a factor between 2 and 10. It works on UNIX and NT (on the latter functioning just as an interface to CAL). Note: newer versions may be present at http://www.perl.com/CPAN-local/modules/by-module/IPC/DSB/.