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/.