Is thit true that all browsers on windows OS work thru winsock? thanks
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I think that all the browsers use actually Winsock2. It has several extensions over Winsock, most are related to the support of overlapped (asynchronous) I/O on sockets.
Specifically MS Internet Explorer uses a higher-level library called WinINet. Which in turn of course uses Winsock2.
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I don’t know for a fact that they all do (what does “all” mean, anyway?) But what else would they use? Winsock is the Windows Sockets API, through which access to network cards is mediated.