Shift-Alt-T - Set a trace track point
 Set a trace track point.
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 This option allows you to mark a variable as a trace track point.

 How many times have you lost the contents of a variable when it was passed
 down from one function to another, received as the wrong parameter, passed
 by reference when it was not supposed to be, passed without a reference when
 it was supposed to be.

 A trace track point will allow you to mark the same variable as a track
 point within different routines. In this way you can keep a track on the
 exact contents of a variable within any function, allowing you to watch each
 instance of a variable within different functions as it is passed down. Each
 time that one of the track point changes the execution of the program will
 stop, allowing you to take a look and see which occurrence changed.

 You may either position the cursor on the piece of code that you wish to
 trace and press <Shift><Alt><T>, or you may position the cursor at the start
 of an expression, and mark the expression using the <Shift><←> or <Shift><→>
 to highlight the expression that you wish to trace and press
 <Shift><Alt><T>.

 This will add this trace track point to the watch window. If the watch
 window is not already opened it will be opened when you add a trace point, a
 break point, a watch point, a trace track point or a watch track point.

 The following information will appear in the watch/trace/track window for a
 trace track point

 For a variable:

        <expression name>, <vwp>, <var type>, <stackitem>, <type>, <contents>

 where:
        <var name> is the name of the variable being traced
        <vwp> may contain 'vwp' for a watch point, 'vtp' for a trace point
        <var type> is local, Public, Static or private
        <stackitem> is the entry in the stack
        <type> is the trace  variable's contents type
        <contents> is the actual contents of the expression