# System Variables

GFN | Highest Available Global Channel

Numeric System Variable

## Contents

Integer, highest available global channel

## Description

The GFN variable contains a numeric value (integer) representing the highest available (i.e. not open) global file channel. This value will be in the range 64 to 127 (32768 to 65000 if the 'XF' system parameter is set).

## See Also

'XF' Extended File Channels

## Example

set_param 'XF'
?gfn
65000
set_param -'XF'
?gfn
127