# System Variables

HFN | Highest Available Local Channel

Numeric System Variable

## Contents

Integer, highest local channel/file number not open

## Description

The HFN variable contains a numeric value (integer) representing the highest available local channel/file number. This value will be in the range 0 to 63 (0 to 32767 if the 'XF' system parameter is set).

## See Also

'XF' Extended File Channels

## Example

?hfn
63
set_param -'XF'
?hfn
32767