When using the Steam API, this function can be called to check that the Steam client API has the overlay functionality enabled.
steam_is_overlay_enabled();
Boolean
global.steam_api = false;
if steam_initialised()
{
if steam_stats_ready() &&
steam_is_overlay_enabled()
{
global.steamapi =
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.