The time to lecture on the screen to do the marking and painting lines you

In my lectures, some feel that the mouse on the local students do not know, do not know is that the projector or how, would like to have a tool to do under the tag allows the students to see more clearly some do not Know who can provide a software tag! Thank you, the first!

Have a software Epen, can be drawn on the screen, there is a need to increase I have a friend or send a letter stations you do not know what software, if you use the ppt, the software itself provides the function of the brush, allowing the user to use a variety of colors for marking ppt, and under no special The software, ppt to use more players like the right time