# u90 user exit

The u90 user exit returns the file of
files number for the file most previously referenced in the FlashBASIC
or BASIC program.

## Syntax

```
fofnum = oconv("", ’u90’)
```

## Description

This user exit is used by the get-fof command.

The user must open the desired file
before using this user exit.

## See also

- [get-fof command](https://d3codex.com/tcl/get-fof-command/)

---
Source: https://d3codex.com/pickbasic-flashbasic/u90-user-exit/ - part of the D3Codex reference.