Slackware's package management system is very simple and effective. Run
installpkg and all the files in the package get installed in the right place, installation scripts get run and a record of the installation gets stored in
/var/log/packages. The time stamp on the file in /var/log/packages also tells you
when the package was installed (very handy sometimes).
Of course, if you no longer need the package then you can run
removepkg and all of the package's files (not shared by other...