---
layout: stdlib-reference
---

# attribute [COM]

> #### Experimental Feature
> The feature described in this page is marked as experimental, and may be subject to change in future releases.
> Users are advised that any code that depend on this feature may not be compilable by future versions of the compiler.

## Description

Mark an interface as a COM interface. Valid only on CPU target.

## Signature

<pre>
[<a href="com-012.html">COM</a>(<a href="com-012.html#decl-guid" class="code_param">guid</a> : <a href="../types/string-0/index.html" class="code_type">String</a>)]
</pre>

## Parameters

####  <a id="decl-guid"></a>guid  : [String](../types/string-0/index.html)
The GUID of the COM interface.