Mac users interested in Idisplay 2.2 generally download:
iDisplay turns your iPhone, iPad, iPad Mini or Android into an external monitor for your Mac or Windows PC. Create something and share it with your audience. If you're a teacher, invite your students to join you for a beautiful demo. If you're on a meeting, share that spreadsheet with your partners. If you're having friends at your place, share family vacation photos.
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Turn your Android or iOS device into an extra touch screen monitor for your Mac or PC.
mind that iDisplay...use iDisplay...secondary display, iDisplay