Example: `cl_chatsound` is clearly a client cvar (**cl_*** cvars are client cvars), only can be declared inside a **`#ifdef CSQC`** block.
+- **hud_*** cvars:
+
+Example: `hud_progressbar_alpha` is a client cvar (**hud_*** cvars belong to client cvars), only can be declared inside a **`#ifdef CSQC`** block.
+
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