I originally posted to the r/steam_link subreddit, so I'm putting it here as well!

Hey all, I decided to compile a few frequently asked questions/instructions here so that it’s easier to find and point people to. There are many different ways to accomplish what I am going to describe here, this is just the most basic, manual method of getting things set up.

Adding Non Steam Games/Programs to Steam

In order to stream games and programs not from the steam store via Steam Link, it is best to add them to steam as Non-Steam games for full functionality

For non-DRM games or emulators, you can add these games directly from this window.

But if you want to have separate controller configurations for each emulated game, you should follow the instructions later in the guide to add each emulated game instead of the emulator itself.

If you’re adding a game from another launcher/store(Epic, Origin, Uplay) with DRM (which most games have, except those from GOG), you’ll need to use one of two programs to coordinate opening the launcher, starting the game, and getting steam to hook into the game process instead of the launcher, then closing the launcher when it’s no longer needed. There are 2 programs that I recommend to accomplish this, they are OSOL and GloSC.

OSOL & GLoSC

These programs handle the coordination in different ways, and I recommend each for different things. While OSOL opens the launcher, launches the game, focuses steam on the game process, and then closes the launcher when the game process exits, GloSC opens the game normally but instead of Steam hooking into the game process directly, it hooks into a transparent window created by GloSC.

For Origin, Epic, Uplay, and Battle.net games I recommend using OSOL since it tends to perform the best in cases when the process can be hooked into. For Windows Store games I recommend GloSC since UWP apps cannot be hooked into, so OSOL will not work. In addition, there are a few cases where games will prevent processes from hooking into them (rejecting the Steam Overlay, and thereby Steam Input) so GloSC is the only alternative in these cases as well.

Configuring OSOL

OSOL can be downloaded from https://github.com/WombatFromHell/OriginSteamOverlayLauncher/releases, where the releases are packaged as .zip files. Once unpacked the only file of importance is the OriginSteamOverlayLauncher.exe file, which is both used to configure OSOL and to run OSOL itself. When first run, you will be asked to choose the path to your game executable

and then asked to choose the path to the launcher executable.

Selecting the game and launcher executables will generate a .ini file containing the configuration for that instance of OSOL, so if you select the wrong files or mess up, don’t worry! You can still change the configuration directly from the ini file, which looks like this:

[Paths]
GamePath= | Path to the game executable
LauncherPath= | Path to the launcher executable
LauncherArgs= | Arguments to pass to the launcher
LauncherURI= | URI to pass to the launcher (rather than launching via a game executable, Epic uses these to launch the game)
GameArgs= | Arguments to pass to the game
MonitorPath= | Path to the executable that should be hooked into and monitored to determine when the game is closed
PreLaunchExecPath= | Path to an executable to be launched before the game or launcher is opened
PreLaunchExecArgs= | Arguments to pass to the pre game executable
PostGameExecPath= | Path to an executable to be launched after the game or launcher is closed
PostGameExecArgs= | Arguments to pass to the post game executable
[Options]
ReLaunch=True | Whether to attempt to re-launch the launcher when started 
SkipLauncher=False | Whether to skip opening the launcher
CloseLauncher=True | Whether to close the launcher when the game exits
AutoGameLaunch=True | Whether to automatically launch the game
MinimizeLauncher=False | Whether to attempt to force the launcher to minimize
ElevateExternals=False | Whether to run the pre/post executables as admin if OSOL is run as admin
PreGameLauncherWaitTime=15 | How long to wait after the launcher has been detected 
PreGameWaitTime=0 | How long to wait before launching the game
PostGameWaitTime=0 | How long to wait after launching the game
ProcessAcquisitionTimeout=120 | How long to wait for the game/monitored process to be detected
InterProcessAcquisitionTimeout=15 | How long to wait when attempting to re-aquire the game/monitored process
GameProcessAffinity= | Core affinity
GameProcessPriority=Normal | Priority of the game process
[Info]
ReleaseVersion=1.0.9.8

Of these options, you’ll mostly use the Game and Launcher Paths, the Launcher Args and URI, and on occasion the MonitorPath. Rather than re-write everything already in the OSOL wiki, I’ll point you to it instead: https://github.com/WombatFromHell/OriginSteamOverlayLauncher/wiki

Finally, to add the game to steam, add the OriginSteamOverlayLauncher.exe to Steam, then rename it to the game name from the shortcut properties.

Configuring GloSC

GloSC is quite a bit easier to set up. You can download the installer from https://github.com/Alia5/GloSC/releases, which will install the GloSC program which manages all games added via GloSC.

In order to use it, simply launch the program, click create and enter the information for the game.

Usually you will want to have “Launch Game” and “Close shortcut when launched Application Closes”, but it depends on what you’re trying to launch. You can either enter the path by typing, by clicking the three dots […], or by clicking the UWP button to add a UWP game.

Often the UWP app list is incomplete, so you will need to enter the path manually. The easiest way to get the path of a UWP app is to make a shortcut to the app on your desktop (right click it and add it to your start menu, then drag it to your desktop) and then open the properties for the shortcut.

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Often the path will be longer than the preferences window, so you can drag the shortcut into notepad to view the whole path. There will be spaces between every character, so just replace the spaces with nothing to make it easier to read .

The path will always end with “!Something”, and often the “Something” is “App” or “Game” which makes it easier to find the path in the file.

Now that you have the path for the UWP app, just put that into OSOL as the path and click save to create the shortcut.

Once you’ve added all the GloSC shortcuts you want, you can add all of them to steam using the “Add all to Steam button” but be careful since this will close Steam.

Emulators

While you can add most emulators directly to Steam as Non-Steam games, adding the games themselves allows you to have separate controller configurations for each emulated game, and to seamlessly load an emulated game alongside the PC games in your collection. Generally you add the emulator as a non steam game, then go into the properties for the shortcut and add the path to the Rom File.

Some emulators need additional flags before or after the ROM File, and I’ll give some example configurations below:

Yuzu/Citra/PPSSPP/ReDream/RPCS3/Xenia: “Path to emulator executable” “Path To Rom File”

Dolphin: “Path to Dolphin executable” -b -e “path to ROM file”

CEMU: “Path to CEMU executable” -f -g “path to ROM file”

PCSX2: “Path to PCSX2 executable” “Path To Rom File” --nogui --fullscreen

Retroarch: "path to retroarch executable" -L cores\emulator core .dll file "path to rom file"

ePSXe: "path to ePSXe exectuable" -nogui -loadbin "path to rom file”

DRM Free (GOG, Twitch Gaming)

This one is easy. If your game has No DRM, just add it as a non-Steam game directly. That’s it!