# Handle multiple screen shares

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By default, a session allows one screen share at a time. The host can allow several users to share simultaneously, after which each viewer chooses which share to render.

## Host: enable multiple shares

To let more than one user share at the same time, the host calls `enableMultiShare`. Read the current state with `isMultiShareEnabled`.

```cpp
IZoomVideoSDKShareHelper* pShareHelper = m_pVideoSDK->getShareHelper();

// Allow simultaneous shares.
pShareHelper->enableMultiShare(true);

// Check whether multiple sharing is enabled.
bool isMultiShare = pShareHelper->isMultiShareEnabled();
```

## Host: lock sharing

To prevent anyone other than the host from starting a share, call `lockShare`.

```cpp
m_pVideoSDK->getShareHelper()->lockShare(true);
```

## Choose which share to render

Each share a user has active is represented by an `IZoomVideoSDKShareAction`. Get the list with `getShareActionList`, then subscribe to the pipe of the share you want to display. Use `getShareSourceId` to tell concurrent shares apart, and `getShareStatus` to confirm a share is active before subscribing.

```cpp
IVideoSDKVector<IZoomVideoSDKShareAction*>* pShareActions = pUser->getShareActionList();
for (int i = 0; i < pShareActions->GetCount(); i++)
{
    IZoomVideoSDKShareAction* pShareAction = pShareActions->GetItem(i);

    if (pShareAction->getShareStatus() == ZoomVideoSDKShareStatus_Start)
    {
        unsigned int sourceId = pShareAction->getShareSourceId();
        IZoomVideoSDKRawDataPipe* pSharePipe = pShareAction->getSharePipe();
        // Subscribe to pSharePipe for the share the viewer selected.
    }
}
```

For the subscription and rendering flow, see [Receive raw data](/docs/video-sdk/linux/raw-data/receive-raw-data/).