# u0191 user exit

User exit u0191 sets system execution
lock number 9. If the lock takes place successfully, the next physical
line of the Proc is skipped. When it does not lock successfully, the
line immediately following the user exit is performed.

## Example(s)

```
PQ
U0191
XUnable to lock at present...
OHere we go...
```

## See also

- [lock statement](https://d3codex.com/pickbasic-flashbasic/lock-statement/)
- [Port number](https://d3codex.com/definitions/port-number/)
- [PROC processor user exits](https://d3codex.com/proc/proc-processor-user-exits/)
- [u1191 user exit](https://d3codex.com/proc/u1191-user-exit/)
- [u2191 user exit](https://d3codex.com/proc/u2191-user-exit/)
- [u3191 user exit](https://d3codex.com/proc/u3191-user-exit/)

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Source: https://d3codex.com/proc/u0191-user-exit/ - part of the D3Codex reference.