kstats are data structures maintained by various kernel subsystems and drivers. They provide a mechanism for exporting data from the kernel to user programs without requiring that the program read kernel memory or have root privilege. See kstat(3KSTAT) for more information.
In the Solaris 8 release, a new command, kstat(1M), is available that enables selection and display of kstats with a command-line interface. A Perl module, kstat(3EXT), is also available to process kstat information.