# WBT_PutUserData

## C Specification

  `#include <nitro/wbt.h>`
  `BOOL WBT_PutUserData(u16 target, const void *user_data, int size, WBTCallback callback);`

## Arguments

target | The target AID bitmap that sends data. The target can specify multiple parents or children at once.
user_data | The buffer where send data is stored. This buffer is copied to separate memory during the function call, so you can use it freely after this function.
size | The send size of the data. Any size less than `WBT_SIZE_USER_DATA` can be specified.
callback | `WBTCallback` format function that receives notifications when commands are completed. This callback is called from within the `WBT_MpParentRecvHook` or WBT_MpChildRecvHook functions.

## Return Values

If no command is currently processing, the function issues the command and returns TRUE. Otherwise, the function does nothing and returns FALSE.

## Description

Sends an arbitrary small-scale data block to the specified target device.
The call fails if a command is still processing.

## See Also

`WBT_RequestSync, WBT_GetBlockInfo, WBT_GetBlock`

## Revision History

06/01/2005 Added text indicating that the callback is called from the WBT_MpParentRecvHook or WBT_MpChildRecvHook functions
09/21/2004 Initial version