Answer / tarun singla

A windows service is an application which when installed on
a system, appears in the services console window
(services.msc). It is different from a standard exe in the
sense that we define/configure a time interval at which
this application would run on a regular basis. So this time
interval is taken care of by the Windows and it executes
that application at regular intervals. Whereas in a
standard exe is would not be the case. One has to click on
that exe each time he wishes to execute that application.

Answer / sweetu

Windows Service applications are long-running applications
that are ideal for use in server environments. The
applications do not have a user interface or produce any
visual output. Any user messages are typically written to
the Windows Event Log. Services can be automatically started
when the computer is booted. They do not require a logged in
user in order to execute and can run under the context of
any user including the system. Windows Services are
controlled through the Service Control Manager where they
can be stopped, paused, and started as needed.

Read more:
http://wiki.answers.com/Q/What_is_a_Windows_Service_and_how_does_its_lifecycle_differ_from_a_standard_EXE#ixzz1H3qoDnz8

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