Instead of returning your real ID, the DLL returns a randomized or modified string.
Technical Overview: Silkroad Online HWID Bypass Mechanisms A in Silkroad Online (SRO) is a method used to circumvent server-side restrictions that limit the number of game clients per computer or prevent banned players from returning. These restrictions are typically enforced by third-party "Game Guards" or custom server DLLs that identify a machine's unique hardware "fingerprint". Understanding the HWID Fingerprint
Bypassing these limits usually involves "spoofing" or masking these IDs so the server thinks you are using a different computer. HWID Spoofers