# OS_IsCodecTwlMode

## Syntax

  `#include <nitro/os.h>`
  `BOOL OS_IsCodecTwlMode( void );`

## Arguments

None.

## Return Values

`TRUE` indicates that the codec is running in TWL mode.

`FALSE` indicates that the application is running in some other mode (that is, in NITRO mode).

This function is replaced with the constant `FALSE` when using a NITRO-only ROM.

## Description

Determines whether the codec is running in TWL mode.

This function checks the operating mode and ROM header, among others, when using a TWL/NITRO hybrid ROM or a TWL-only ROM, and then returns a value. However, when using a NITRO-only ROM, the function itself is replaced with `FALSE`.

## See Also

`OS_GetConsoleType`

## Revision History

2008/10/08 Initial version.

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