A name of a package can be passed directly to lpm's -i, -u, or -a option. They normally receive a list of filenames, a list of package files to install. If a given name does not exist it is interpreted as a name of a package. All default remote repositories are searched for the package. lpm then downloads and installs the package. Or:

lpm --update

This deceiving small command does quite a bit: it checks all default remote repositories for updates to any existing package, which are downloaded and installed.