What i miss from
EmEditor Help - EmEditor Macro Reference - Tutorial > Dispaly a Message Box

Since the MS page tend to disappear, and for quick access, I miss some configuration details directly in the help...

... like...

object.Popup(strText,[nSecondsToWait],[strTitle],[nType])

nType
Optional. Numeric value indicating the type of buttons and icons you want in the pop-up message box.
These determine how the message box is used.

Button Types
Value Description
0 Show OK button.
1 Show OK and Cancel buttons.
2 Show Abort, Retry, and Ignore buttons.
3 Show Yes, No, and Cancel buttons.
4 Show Yes and No buttons.
5 Show Retry and Cancel buttons.

Icon Types
Value Description
16 Show "Stop Mark" icon.
32 Show "Question Mark" icon.
48 Show "Exclamation Mark" icon.
64 Show "Information Mark" icon.

The return value intButton denotes the number of the button that the user clicked.
If the user does not click a button before nSecondsToWait seconds, intButton is set to -1.

Value Description
1 OK button
2 Cancel button
3 Abort button
4 Retry button
5 Ignore button
6 Yes button
7 No button

(from http://msdn2.microsoft.com/en-us/library/x83z1d9f.aspx)