Requirement: Use multiple Root-Components in the same Application This Root-Components use the same Implementations and Services Display the Root-Components on the same Single-Page Solution: App-Module preparation: import { BrowserModule, DOCUMENT } from '@angular/platform-browser'; import { NgModule, Inject, Component } from '@angular/core'; export class AppModule { private browser_document; ngDoBootstrap(appRef){ if(this.browser_document.getElementsByTagName('app-root1').length > 0){appRef.bootstrap(AppComponent1);} if(this.browser_document.getElementsByTagName('app-root2').length > 0){appRef.bootstrap(AppComponent2);} } constructor(@Inject(DOCUMENT) private document: any){ this.browser_document = document; } } Service preparation: Angular 2 has two options to provide a service. 1. Single instance For a multiple implementation of more Root-Components we need the second opt...