Multi-touch refers to a touch sensing surface's (trackpad or touchscreen) ability to recognize the presence of two or more points of contact with the surface. This plural-point awareness is often used to implement advanced functionality such as pinch to zoom or activating predefined programs.

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Is it possible for apps to interfere with multi-touch system wide?

I'm having multi-touch issues with Swype. However, other users with same phone are reporting A-OK, so I'm wondering if PEBKAC or ID-10-T. However, I have tested bone stock after a factory reset and ...
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Multitouch partially not functional

I have problems with multitouch (2 fingers) on my Acer Z120. Using MultiTouch Tester, I found out that when my two fingers are on the same y-axis, there is only one finger detected whose x value seems ...