Zoom++ is an enhanced version of the Microsoft ZoomIn utility which comes as part of the Windows SDK. This version is useful if you want to be able to perform some mouse command very accurately in a Window that does not have its own zoom capability, or where you don't want to use that capability for some reason. This version also supports a simple undo, so that if you click inside the zoomed display or do something else to unintentionally change the area of the screen Zoom++ is highlighting, you can press Ctrl+Z to restore the previous area.
Click and hold down the left mouse button inside the Zoom++ Display. A rectangle will be displayed in inverted colors showing what Zoom++ will zoom in. Drag this rectangle to the desired part of the screen. As you move the rectangle the title-bar will be updated to show exactly what is being zoomed in on.
When you have found the right area of the screen you want to zoom in, release the mouse button. Press Esc to cancel and restore the previous zoomed area if you have pressed the left mouse button unintentionally.
You can also use the arrow keys to move the zoomed area a pixel at a time in the appropriate direction, or with the shift key pressed to move by 8 pixels. Pressing ctrl and an arrow key moves the window to one of the corners of the screen.
Once you have captured an image, it will only be updated if you move the window, change the magnification, enable the refresh timer, or select the Refresh option from the menu or by pressing F5. This makes it easier to capture the image of another program at a specific moment.
Once you have the correct area zoomed you can change the magnification using the scroll bar. On most displays the default magnification should be sufficient to allow you to accurately locate any pixel. A tooltip is displayed showing the original location and location of each pixel Zoom++ has captured.
If you would like to click on this pixel but the original pixel is hard to locate exactly, then right click on it in the Zoom++ display. This will open a pop-up context menu that will allow you to send various types of click to the program which "owns" that pixel.
If the program that owns the pixel supports selecting an area using click and drag, then you can also do this via Zoom++. Press and hold-down the Ctrl key, and then left click and hold in Zoom++ on the pixel that you want to be the top left of your chosen area. Then drag the mouse to create your desired selection rectangle. When you release the left mouse button a context menu will offer you the chance to create the same selection in the program that owns the original pixels.