DSR—User-Defined Keys (VT Level 4 Only)
The host asks if the user-defined keys (UDKs) are locked or unlocked.
Format
| Exchange | Sequence | Meaning |
|---|---|---|
| Request (Host to terminal) |
CSI ? 25 n | The host asks if UDKs are locked or unlocked. |
| Possible responses (Terminal to host) |
CSI ? 20 n | UDKs are unlocked. |
| CSI ? 21 n | UDKs are locked. |