# Which QLM features are available on each platform?

QLM supports Windows and non-Windows platforms.

On Windows, QLM uses a .NET-based API to protect your application. We currently support .NET Framework, .NET Standard, and .NET Core. Note that the .NET-based API can be used from most programming languages such as VC++, C++ Builder, Office Apps, Delphi, etc.

On non-Windows platforms, QLM uses a combination of a REST API and a platform/language-specific client-side library (source code included) to protect your application. Some of the features available on Windows are not currently supported on non-Windows platforms. The section below lists **some** of these features (this is not an exhaustive list):

* On-premise floating / concurrent licensing.
* QLM License Wizard: the license wizard is a Windows executable that is only supported on Windows. A cross-platform version of the wizard is in progress. It will be based on .NET Core.
* The [Application API](https://docs.soraco.co/docs/api-reference/.net-api/qlmlicense/application-methods) and [Management API, ](https://docs.soraco.co/docs/api-reference/.net-api/qlmlicense/management-methods)which are .NET based, are not supported on non-Windows platforms. Instead, you can use [the REST like API](https://docs.soraco.co/docs/api-reference/http-methods) to communicate with the License Server for operations such as activating a license key, validating a license key, or deactivating a license key.
* MaxDaysOffline: the ability to specify the maximum number of days a user can go without contacting the license server.
* Predefined License Binding, i.e. only UserDefined license binding is supported.

In short, the operations that can be performed, out-of-the-box, from a non-Windows application are:

* Activating a license key
* Validating a license key
* Deactivating a license key