COM

A-1 Technology is a perfect destination to get the top quality service as we have expertise in COM technology. Our team comprises of specialists of COM technology enabling our clients to take maximum benefit in COM. We have here by offered you a brief account about the technologies letting you know about there use.COM is the most commonly used syntax in Microsoft world. The full form of COM is Component Object Model. it is a technology in the microsoft windows family of operating systems that enables the software components to communicate. COM is used by developers to create re-usable software components, link components together to build applications, and take advantage of Windows services. COM is a feature of Windows. Each version of Windows has a support policy described in the Windows Product Lifecycle. COM continues to be supported as part of Windows. COM is a feature of the next version of Windows, Windows Vista.

.com or commercial is a genetic top level domain that is used on the Internet's domain name system. In the English language it is consistently pronounced as a word, dot-com and has entered common parlance this way. It is used to enable interprocess communication and dynamic object creation in a programming language that supports the technology. The term COM is often used in the software development world as an umbrella term that encompasses the OLE OLE Automation, ActiveX, COM+, and DCOM ( Distributed COM) technologies.

DCOM

DCOM is a short form of distributed COM that stands for Distributed Component Object Model. It can be seen as the next logical step over COM. DCOM lets a COM programmer to extend their components over network, giving them the benefits of distributed computing. COM 'DLL' can not be used over DCOM. When the client and component both resides on the same computer they communicate with the help of Local Procedures Call (LPC), but over the network they have to use the DCOM proprietary standard built by Microsoft. COM components over the network behave the same way as if they are on the same machine with the client.

The DCOM comes pre-installed on Windows NT and Windows 2K and mostly in Windows XP too. If you are using other versions like Windows 9x, then you must check that the DCOM98 extensions are installed on your computer, otherwise check for the DCOM98 extensions. DCOM stood in competition of COBRA. Proponents of both of COBRA and DCOM became the model for code and service-reuse over the web world. however there are some difficulties involved in getting either of these technologies to work over internet firewalls and on unknown and insecure machines, meant that normal HTTP requests in combination with web browsers won over both of them.

COM+

COM+ is the name of the COM-based services and technologies first released in Windows 2000. COM+ brought together the technology of COM components and the application host of Microsoft Transaction Server (MTS). COM+ automatically handles difficult programming tasks such as resource pooling, disconnected applications, event publication and subscription and distributed transactions.

COM+ builds on and extends applications written using COM, MTS, and other COM-based technologies. COM+ handles many of the resource management tasks that developers previously had to program, such as thread allocation and security. COM+ is both an object oriented programming architecture and a set of operating system services. It adds to COM a new set of system services for application while they are running, such as notifying them of significant events or ensuring they are authorized to run.

COM+ is intended to provide a model that makes it relatively easy to create business applications that work well with the Microsoft Microsoft Transaction Server in Windows NT or subsequent system.