Tokens Related to the Help Menu
The Wolfram Language allows any front end command to be executed programmatically from within the kernel by sending an appropriate front end token. There are tokens for all standard menu commands—as well as ones not accessible directly with the default front end menu configuration.
"SelectionHelpDialog" — search the Documentation Center for the selected function
"ExplainBeepDialog" — open a dialog explaining why the front end produced a beep
"AboutBoxDialog" — open a dialog containing information about your Wolfram System