. . .more on Formulas 

. . . more on Charts 

Above is a Daily Chart of an AOL May 70 Call (AOO EN).  The bold green line in the lower window pane represents the TD REI line, as specified in the preferences below.

. . . more on Preferences 

• Date Time (Start, End) - This determine which bars the trendline will begin and end on.  Since the trendline can be drawn using the trendline button on the chart toolbar, and can be dragged easily to the any exact position, it's generally not necessary to use this control.

• Value (Start, End) - This determines the price values used for the start and endpoints of the trendline.  Again, since the trendline can be drawn using the trendline button on the chart toolbar, and can be dragged easily to the any exact position, it's generally not necessary to use this control.

• User-specifies slope - Instead of specifying both a starting and ending point for the trendline, the user may specify a starting point and a slope.  The slope should be expressed in price/bar.  For instance, a slope of -0.45 would mean that then line slopes downward at a rate of 45 cents per bar.

• Project to Present - This option projects the trendline(s) forward past then ending point of the trendline to the right side of the chart, as seen in the illustration above.

• Use Realized Price . . .  - This option forces the use of actual price data at the as the beginning and ending price values.  For instance, if "Use Realized Price...Close" was specified, the closing prices of the starting and ending bars would be used as the start and end price values of the trendline.

• Alert with . . . - This option will create an audible alert when prices break the base trendline.

• Draw Parallel line . . . % above/below - The user can choose to have parallel trendlines drawn any percent above and/or below the base trendline.  Multiple values may be entered in each box, separated by either a comma or a space.  For instance, "1, 3, 6" would result in parallel lines 1, 3, and 6 percent from the base trendline.

• Repeat Parallel Lines ... Times -  This option will replicate all parallel trendlines.  For instance, if the user chooses to repeat parallel lines 4 times, as seen above, then the 3% parallel line will be repeated at 6%, 9%, 12%, and 15% as seen in the illustration above.

• Mirror Parallel Lines - This option causes all parallel lines to be mirrored on the opposite side of the trendline.  As seen above, the parallel lines above the trendline are mirrored below the trendline.

• One Color - Forces trendlines and all parallel lines to use the same color and line width (the Trendline Color).

• Trendline Color - Color of the base trendline.

• Parallel Above/Below Colors - Color the the parallel lines above and below the trendline.

Multiple parallel lines may be drawn both above and below the base trendline.  The parallel line text boxes accept multiple percent values if desired, separated by a space of a comma (eg. "3.2, 4.5, 7.1").  The distance of each parallel line from the base trendline is determined using a percent level.  The percent level represents a percentage of the price where the base trendline begins.  For instance, a parallel line drawn 1% above a trendline that has a beginning point of $50 would be drawn exactly 50 cents above the base trendline at all points.  The parallel lines may also be repeated any number of times.  In the example above, repeating the parallel line 4 times would result in additional lines $1.00(2%), $1.50(3%), $2.00(4%), and $2.50(5%) above our base trendline, for a total of 5 parallel lines above.  These parallel lines may also be mirrored on the opposite site of the trendline.  Using the example above, parallel lines would also be drawn at 1%, 2%, 3%, 4%, and 5% below our base trendlines.  The trendline furthest below would begin at $47.50 and remain $2.50(5%) below the base trendline at all points.  If you prefer to see parallel lines on your trendlines by default, you may do so by adjusting an existing trendline to display the desired parallel lines (repeating, mirrored, etc.), and then click the "Make Default" button at the bottom of the trendline preferences window.  The base trendline, parallel lines above, and parallel lines below, each have their own color preferences.  The one color checkbox forces all lines to use the trendline color.

Attempting to draw a trend line in a chart sub window that contains only technical indicators results in an error message. If you have a chart containing two or more instruments, as long as each instrument resides in its own sub-window, you may draw as many trend lines as you like on each instrument. If you have two or more instruments in the SAME sub window, any trend lines drawn in the sub window will be associated with the first instrument in the sub window. 

Trend Lines can be adjusted using the mouse. Mouse down at one end of the trendline and drag. Trend Lines are anchored at one end as you move the other end of the trend line to its new position. You can duplicate a trend line by dragging with the Ctrl (option on Macintosh) key down. The original line remains the same as before the drag.