CALLIDX
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Get the ID associated with the current sprite or text screen callback.
During a sprite or text screen callback, `CALLIDX` will return the ID of the sprite or text screen this callback is associated with. Otherwise -1 is returned.
* Syntax
```sbsyntax
CALLIDX out id%
```
|* Output | Description |
| `id%` | ID associated with current callback. If no callback is running, -1. |
* Examples
```sb4
'CALLIDX example with multiple sprites
FOR I=0 TO 9
SPSET I,0
SPFUNC I,"CALLBACK"
NEXT I
CALL SPRITE
DEF CALLBACK
'prints the current sprite ID
PRINT CALLIDX()
END
```
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