|dlc_id||The unique identifier for the DLC to be checked (an integer).|
If your game has DLC created for it, you can use this function
to check and see whether the user has installed it before accessing
any files associated with it. The function returns true if
the player has the content installed, and false if the
user does not, but note that the user must also own the DLC, so you
should use the additional function of steam_user_owns_dlc to
check that it is owned as well before using it.
global.Level_Max = 100;
global.Level_max = 200;
The above code will check to see if the user has bought, and installed, the DLC with the id 10354, and if so set a global variable to a different value.