# Header
The header API is available on the globalContext and allows to add content on the viewer header. The API is the following:
| Property | Description | 
|---|---|
addContent(content: HeaderContent) |  Add content into the header. | 
removeContent(contentName: string) |  Remove a content by its name. | 
headerContent: Map<string, HeaderContent> |  A map containing the header content objects. | 
The HeaderContent interface is the following:
| Property | Description | 
|---|---|
name: string |  Required A name to identify the content. | 
component: Object |  A Vue.js 3.x component to be rendered on the viewer header. | 
position: "left" or "right" |  The position of the content on the viewer header. | 
order: number |  A number for sorting the content along other contents displayed on the same side on the viewer header. | 
Here is an example of a plugin using the startupScript option to register content into the viewer header:
bimdataViewer.registerPlugin({
  name: "headerPlugin",
  startupScript($viewer) {
    const { globalContext } = $viewer;
    
    globalContext.header.addContent({
      name: "window-manager",
      component: MyComponent,
      position: "right",
      order: 1,
    });
  }
})