SLSsteam has a toggleable API. If it's enabled you can write commands into /tmp/SLSsteam.API
API commands are split by using | as a seperator. So for example to install spacewar to library 0 you can write install|480|0 into SLSsteam.API
Arguments written in square brackets [] are optional
The current commands are:
dumplibraries : Lists all available libraries' label, their path & their index
install|appId|libraryIndex : Installs appId into library at libraryIndex
uninstall|appId : Uninstalls appId
dumpcompat|appId : Lists all available compatibility tools for appId
getcompat|appId : Lists the current compatibility tool for appId
setcompat|appId[|tool-name] : Set's or clears the compatibility tool for appId