Collaborative Cross-Applications, or xApps, is collective term applied to a range of software products from German software giant SAP AG. xApps are commonly targeted at specific industries or are geared towards vertical applications common across a range of industries. xApps typically have a smaller footprint than some of the company's other business applications such as MySAP.
As of October 2006, SAP offered xApps targeted at Product lifecycle management, supply chain management, manufacturing intelligence and other areas.

Its basic function is to allow web development based on SAP standard solutions (usually developed under the ABAP programming language, but in the newer versions also in Java programming language). With Web AS, it is possible - for example - to publish queries, programs and ABAP applications in a web environment but linked to and based in a SAP solution infrastructure. The newer versions of the (WAS or WEB AS) also support open standards like Java programming language. From the versions 6.20 and higher it is possible to create ABAP only, Java Platform, Standard Edition only or mixed environments.

SAP R/3 is a computer system that is designed to support complete business management tasks of a corporation, company or institution. SAP R/3 is used in business systems to handle invoice payment, production resource management and financial account control. These specific tasks are accomplished by employing application modules, often described with acronyms such as MM (materials management) and SD (sales and distribution).

Transactional data is data related to a single business event such as a purchase requisition or a request for payment.When you create a requisition, for example, SAP creates an electronic document for that particular transaction. SAP gives the transaction a document number and adds the document to the transaction data that is already in the system. Whenever you complete a transaction in SAP, that is, when you create, change, or print a document in SAP, this document number appears at the bottom of the screen.

There are one of two main screens you see when you first log on to SAP:

• The SAP Menu screen which is the general screen delivered standard with SAP.
• The SAP User Menu screen is customized for MIT transactions and should be the default screen. It displays at least three main menu folders labelled: 1. User menu 2. Role (there may be more than one Roles folder) 3. Favorites.