# ShowAllClientsInRoom(room\_name ) and callback\_ShowAllClientsInRoom()
## Description
This function tells you about all the clients in a room. Enter the room name you want to check for.
#### Syntax
```
ShowAllClientsInRoom(room_name);
```
| Argument | Description |
| ----------- | --------------------------------------------------------------------------- |
| `room_name` |
The name of the RNet room you want to scan. This must be a String
|
#### Returns
```
N/A
```
## How do I see which clients are on this room
After a successful scan of the room name you entered, the callback function **callback\_ShowAllClientsInRoom()** is called. So under Scripts/Rocket Networking/Callback Functions , you can edit this to do whatever you want…
❓ This function returns an array of all client id’s in a room. For example if there are 3 clients with clientId’s 3, 6 and 11 respectively in the room “public”, this function’s callback will return the array \[ “3” , “6” , “11” ] . It is worth noting that these are not numbers in the array, they are strings of the numbers.
### Example Implementation of function call
* So firstly I made 2 clients join the room “public”
* Then I wrote some basic code to try out this function
### Example Implementation of callback(continued)
* Then after I pressed okay, this callback code took place
* Here I’ve just done a show\_message so the user is shown a dialog box with that message but you get the idea
* So what it returned in the end was
```
[7,9]in public
```
## If the room does not exist?
⚠️ If the room you entered does not exist, this callback function will not return an array. **Instead the “array\_of\_clients” variable will be the integer -1.** So a good practice would be to first check if it is an array. If not then the room doesn’t exist. If yes then treat it as an array.
