U can select FreeMotion Grid from the Menu for Free Mouse Motion
Copy the image to the clipBoard to  save it as a bitmap using the copy tool
Choose custom colours from the color box
U can use different mapping modes from the Options Box
Choose Concentric mode for drawing concentric objects faster and vary the distance from the Options  menu.
Choose Radial tool for drawing Hyper - symetrical objects like squares , circles and square rounds and for drawing arcs / chords / pies for circles.
Select show Center from the view menu to see centre of objects as it helps to draw them faster.
Play animation to replay all steps but wait till the animation is complete ( actually i'm not using any separate threads -- work is on in this direction & hopefully in the next version it will be rectified). 
Use Capture tools to copy objects from one place to another
Use Thread tool to draw threads and vary it's distance from the options menu
Please do not make Figures while pressing both the Left Mouse Button and the Right Mouse Button. 
Use Refresh tool to refresh display in case of any display corruption
Use Grid mode for faster drawing
By default all the circular figures like arcs/ chords /pies are drawn counter clockwise only.
By default all parallel lines drawn have a tendency of right alignment to the origin point.
Use Grid Size according to the drawing requirements
Press right mouse button for scrolling 
Use different Pen Styles like Dashed Pen for drawing dissection lines
Be  careful while using the Zoom Out tool as by Zooming out in excess , it doesn't give any output (work is on to remove this bug and hopefully in later versions of this software u won't find it )
The Knuckle Joint is just a demonstration of the capabilities of this software.Further modules like this are planned for the future versions on positive user responses.
U can add your own tips by sinply editing the tips.txt file in the folder having 2dcad.exe file.
For more tips /suggestions /doubts /problems email me at malikmayank@usa.net
I need help in the further development of this project , If any one can help me in developing a version for Linux / Mac or some improvements in this version then u can contact me at malikmayank@usa.net (it's my email id)

