When using the Steam API, this function can be called to check
that the Steam client API has correctly initialised the statistics
for your game.
global.steam_api = false;
if steam_stats_ready() && steam_is_overlay_enabled()
global.steam_api = true;
The above code will set a global variable to true if the Steam client API is correctly initialised, along with the Steam statistics and overlay functionality, or it will set the variable to false otherwise.