Detecting installed SharePoint 2010 and 2013 version

I was looking for share point installed version on my VM and got the same questions from my developers. Here is the simple way to find the exact installed SharePoint version on your machine.
When Share Point is installed on your machine it marks the key in your registry. You can explore to the HKLM\SOFTWARE\Microsoft\Shared Tools\Web Server Extensions\14.0\WSS\InstalledProducts folder by opening REGEDIT window and check which key is placed there.

Following is the list of the registry keys and the specified share point versions.

Share Point 2013

35466B1A-B17B-4DFB-A703-F74E2A1F5F5E", "Project Server 2013

BC7BAF08-4D97-462C-8411-341052402E71", "Project Server 2013 Preview

C5D855EE-F32B-4A1C-97A8-F0A28CE02F9C", "SharePoint Server 2013

CBF97833-C73A-4BAF-9ED3-D47B3CFF51BE", "SharePoint Server 2013 Preview

B7D84C2B-0754-49E4-B7BE-7EE321DCE0A9", "SharePoint Server 2013 Enterprise

298A586A-E3C1-42F0-AFE0-4BCFDC2E7CD0", "SharePoint Server 2013 Enterprise Preview

D6B57A0D-AE69-4A3E-B031-1F993EE52EDC ", "Microsoft Office Web Apps Server 2013

9FF54EBC-8C12-47D7-854F-3865D4BE8118", "SharePoint Foundation 2013

Share Point 2010

BEED1F75-C398-4447-AEF1-E66E1F0DF91E: SharePoint Foundation 2010

1328E89E-7EC8-4F7E-809E-7E945796E511: Search Server Express 2010

B2C0B444-3914-4ACB-A0B8-7CF50A8F7AA0: SharePoint Server 2010 Standard Trial

3FDFBCC8-B3E4-4482-91FA-122C6432805C: SharePoint Server 2010 Standard

88BED06D-8C6B-4E62-AB01-546D6005FE97: SharePoint Server 2010 Enterprise Trial

D5595F62-449B-4061-B0B2-0CBAD410BB51: SharePoint Server 2010 Enterprise

BC4C1C97-9013-4033-A0DD-9DC9E6D6C887: Search Server 2010 Trial

08460AA2-A176-442C-BDCA-26928704D80B: Search Server 2010

84902853-59F6-4B20-BC7C-DE4F419FEFAD: Project Server 2010 Trial

ED21638F-97FF-4A65-AD9B-6889B93065E2: Project Server 2010

926E4E17-087B-47D1-8BD7-91A394BC6196: Office Web Companions 2010

Share Point 2013 APP – Where We Can Use

SharePoint 2013 is the next iteration of Microsoft’s SharePoint document management and collaboration platform. Its, like all recent versions of SharePoint, is a great development platform that allows customizations via supported extensibility models

Share Point App is a brand new extensibility model introduced in SharePoint 2013 that addresses some of the inherent challenges with SharePoint Solutions. The biggest difference between apps and solutions is that apps run completely outside of the SharePoint server, meaning their custom code is executed either in the context of the client browser or on other servers not running SharePoint

There are three types of SharePoint Apps: SharePoint-Hosted Apps, Provider-Hosted Apps, and Azure Auto-Hosted Apps.
SharePoint-Hosted Apps are manifested entirely within SharePoint server and generally have no external dependencies. Their custom code is implemented by leveraging Client-Side Object Model (CSOM) or REST API, and is executed within the context of a browser. SharePoint-Hosted Apps can access libraries and lists to store content. Examples of these kinds of apps are PTO request or expense calculator.
Provider-Hosted Apps may have SharePoint components, similar to SharePoint-Hosted Apps, but the main business logic and data storage are manifested in an external infrastructure, such as an external Web server or in the Cloud. These apps are ideal for integration with external systems, such as a help desk support system. It’s important to note that Provider-Hosted Apps can also be developed using any other non-Microsoft tools and technologies, such as Eclipse or LAMP, due to the fact that their business logic and data storage are provisioned by the external infrastructure.
Azure Auto-Hosted Apps are somewhat similar to the Provider-Hosted Apps in that their main business logic and data storage are manifested in an external infrastructure. However, the Azure Auto-Hosted App package additionally contains the Website and database that is deployed and run outside of SharePoint. When this type of app is installed, SharePoint handles automatic provisioning of the Azure SQL Database and Azure-Hosted Website in an existing Azure account setup in the farm.
Share Point apps are capable enough to replace lots of classical developments. It can be used as option for below listed artifacts

·         Custom Web Parts

·         Event and Feature Receivers

·         Custom Field Types

·         Application Pages