diff --git a/public/icvar.h b/public/icvar.h
index ffb795bd..7a2c1204 100644
--- a/public/icvar.h
+++ b/public/icvar.h
@@ -62,13 +62,14 @@ public:
 	virtual CVarDLLIdentifier_t AllocateDLLIdentifier() = 0;
 
 	// Register, unregister commands
-	virtual void			RegisterConCommand( ConCommandBase *pCommandBase, bool unknown=true ) = 0;
+	virtual void			RegisterConCommand( ConCommandBase *pCommandBase, bool cmdline=true ) = 0;
 	virtual void			UnregisterConCommand( ConCommandBase *pCommandBase ) = 0;
 	virtual void			UnregisterConCommands( CVarDLLIdentifier_t id ) = 0;
 
 	// If there is a +<varname> <value> on the command line, this returns the value.
 	// Otherwise, it returns NULL.
-	virtual const char*		GetCommandLineValue( const char *pVariableName ) = 0;
+	inline const char*		GetCommandLineValue( const char *pVariableName );
+	virtual bool			HasCommandLineValue( const char *pVariableName ) = 0;
 
 	// Try to find the cvar pointer by name
 	virtual ConCommandBase *FindCommandBase( const char *name ) = 0;
@@ -197,6 +198,19 @@ inline ConCommandBase * ICvar::Iterator::Get( void )
 	return m_pIter->Get();
 }
 
+inline const char *ICvar::GetCommandLineValue( const char *pVariableName )
+{
+	if (pVariableName[0] == '\0')
+		return NULL;
+	size_t len = strlen(pVariableName);
+	char *search = new char[len + 2];
+	search[0] = '+';
+	memcpy(&search[1], pVariableName, len + 1);
+	const char *value = CommandLine()->ParmValue(search);
+	delete[] search;
+	return value;
+}
+
 
 //-----------------------------------------------------------------------------
 // These global names are defined by tier1.h, duplicated here so you