A Steam ID is a unique identifier assigned to each Steam user account. It's used to identify players in online games, including CS 1.6. Your Steam ID is linked to your account and can't be changed directly through the Steam interface. However, there are workarounds to change your Steam ID, which we'll discuss later.
From an administrator's point of view, "ID Changers" are a persistent nuisance. steam id changer cs 16 full