Tracking Point ---> "tk"
It helps you to locate a desirable Point in space. Starting from an End Point
without any sketch lines you can dynamic insert any value you want as you pull over your cursor in any direction you desire.
Properties Palettes ---> "Ctrl+1"
It's display the properties changes of a selected geometry and it lets you to modify your Layer, Points, Dimension, Scale, etc.
Enter Snap
Specify snap spacing or [On/Off/Aspect/Rotate/Style/Type] <5>: s (Style)
Enter snap grid style [Standard/Isometric] <S>: i (Isometric)
There are appears now three isometric angles that you can draw.
Set them through the F5 or "Ctrl+E".
_ellipse (Iso Circle )
Specify axis endpoint of ellipse or [Arc/Center/Isocircle]: enter i (Isocircle) right-click
Specify center of isocircle: pick or enter coordinates
Specify radius of isocircle or [Diameter]: enter a number
Recall
This command gives you the ability (when select an object) to call the same command that have been used for the selected object.