can someone help me out finding how to.....

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im trying to find the marker pen that enables you to draw on your screen whilst looking at documents.so i can highlight certain numbers whilst explaining on video to people.ive been through cursor mania and found marker pen style cursers but they dont write.can you show me how to find this tool.thank you to anyone that will be saving me alot of time and trouble for answering this for me.cheers,lee.