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Get correct OS version on win 8.1 without using GetVesionEx API (deprecated )

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Monitor Window Registry Key value change ashynchronously Javascript

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Here is sample code to monitor registry value change without hanging the thread. Its sample code so use properly. var g_DefaultTimeOutForRegMonitoring = 15000; MonitoRegistryValue: function (szRegKeyVal, val) { // Key value path and value to watch var intervalID; var regKey = szRegKeyVal; var value = val; intervalID = setInterval(function (regKey, value) { try { var ret; ret = g_objRegUtil.ReadValueFromRegistry(szRegKeyVal);                 if (ret == value)                 // Check ret value and make decision } } catch (err) { } }, 5); // We will wait for certain time else break the watch setTimeout(function () { clearInterval(intervalID); }, g_DefaultTimeOutForRegMonitoring); }
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Using Java Script detect if OS is 64 bit version or 32 bit.

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Use following html code to show OS version: <html> <script> function onload() { if (navigator.userAgent.indexOf("WOW64") != -1 || navigator.userAgent.indexOf("Win64") != -1 ) {    alert("64 bit"); } else {    alert("32 bit"); } } </script> <body> <body onload="onload()" scrolling="no"> </body> </html> Ref:  UserAgent  (http://msdn.microsoft.com/en-us/library/ms537503%28v=vs.85%29.aspx)
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