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COM APIs
HTMLFile - Represents an HTML document. Can be used to read, write, & interact with HTML.
InternetExplorer.Application - Explore Websites.
msxml2 DOMDocument 6.0 - XML parser (v6.0 requires XP SP3 or newer - see here for compatability with older XP).
scriptcontrol - Dynamically execute VBScript or JScript.
scripting.dictionary - Object that stores data key, item pairs.
scripting.filesystemobject - Access Files & Folders
shell.application - Access Explorer & IE Windows/Tabs; Open & Manipulate Windows.
shell.explorer - Embed an Explorer/Browser Control in a Gui (Internet Explorer - Trident Browser)
SAPI.SpVoice - Speech API: SpVoice - Text-to-Speech (TTS)
vbscript.regexp - VBS Regular Expressions (including global match)
Windows Media Player - Play Media Files; Embed WMPlayer Control in a GUI.
WinHttp.WinHttpRequest.5.1 - Provides simple HTTP client functionality, allowing much more control than UrlDownloadToFile.
winmgmt - Get System Information; Manage Windows Services
WScript.Shell - Various Administration Tasks (many native AHK tasks)
MS Office Applications