As a CPA and I work as a consultant with a diverse range of clients.Application that I encounter is QuickBooks? -

As a CPA and I work as a consultant with a diverse range of clients.Application that I encounter is QuickBooks,Tax software like Lacerte, Proseries, Taxworks, MyOb, Peachtree. Can these application hosted with a single Application service provider

You are right. Dealing with a single Application service provider is easier. One such service provider is Real Time Data services. It can host QuickBooks, Peachtree, MyOb as well as Tax software such as Lacerte, Proseries, Drake and taxwise including others. Not only that they also provide Remote Computer support and managed IT services. All your online computing needs can be catered to by a single service provider. For more information, please visit:- www.myrealdata.com