PassEventsDown is an option to EventHandler which specifies whether events handled by a particular event handler should be passed down to event handlers nested inside.

SyntaxLength["string"] finds the number of characters starting at the beginning of a string that correspond to syntactically correct input for a single Mathematica expression.

"AddFrame" is a front end token that adds a frame around the current selection.

"FindNextWarningColor" is a front end token that selects the next warning message.

"MoveNextLine" is a front end token that moves the insertion point down by one line.

"RefreshDynamicObjects" is a front end token that reevaluates a Dynamic.

"SelectionConvert" converts the selected cells into a new format.

"TrustNotebook" is a front end token that opens the Dynamic Content Warning dialog.

Continue resumes debugging from one breakpoint to the next breakpoint.

Manual Grouping turns on manual grouping to allow cell grouping by hand.