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TAPI (Telephone Application Programming Interface) is part of Microsoft Windows. It gives software applications access to telephony hardware, independent of the hardware it is accessing. This allow applications such as Outlook to be able to dial the phone, or CRM applications to screen pop on inbound calls with relevant details (without the software knowing what the hardware is).
Asttapi was the first open source TAPI driver for use with Asterisk. It has been hugely popular on the sourceforge web site. Because we have neglected it a little its popularity is declining a little. It stills serves as a good reference of how to write a TAPI driver for Windows.