Shift-Alt-I - Inspect
 Inspect a variable.
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 This option allows you to view and edit variables and expressions. God only
 knows what'll happen with DBF expressions.

 Use the arrow keys to the start of the variable or expression that you wish
 to inspect and press <Shift><Alt><I>.  You may also mark an expression or a
 variable to inspect using the <Shift><←> or <Shift><→>.

 This will bring up a variable box, that will contain some form of
 expression.  You may edit this expression.

 Press the ◄──┛ key to confirm the entry, or press the <Esc> to abort the
 entry and restore the original value. If the entry is illegal and error will
 occur.