# Introduction
`GTC` is a command introduced with [MSNP2](../versions/msnp2.md).

It is a Notification Server command, without either a request or response payload.

It modifies whenever your client handles new users in your Reverse List (RL).

# Client/Request
`GTC TrID [ A | N ]`

# Server/Response
`GTC TrID listVersion [ A | N ]`

Where `listVersion` is the new List Version.

# Examples

## Setting to A (Ask before adding to AL/BL)
```
C: GTC 1 A
S: GTC 1 255 A
```

## Setting to N (Automatically add to AL)
```
C: GTC 2 N
S: GTC 2 256 N
```

## Invalid argument
*NOTE: This is an assumption. The actual error code here is unknown.
It may also lead to an Instant Disconnection.*
```
C: GTC 3 B
S: 201
```

# Known changes
* [MSNP10](../versions/msnp10.md) and higher: List Versions are dropped in `ABCHMigrated: 1` mode.
* Removed in MSNP13. You get instantly disconnected if you try using the command.