Keeping left mouse button pressed ( and release)

[InterestedNewbie]

Thanks both, but lef+ only seems to perform a left click it doesn't seem to keep the left mouse button pressed (for dragging around items on the desktop for instance). Also I would like it to be window or application independent is that possible?

Another question, the following left clicks in the center of the screen, but is it also possible to only move the mouse to the center of the screen (no clicking)?

Code:

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lef 0.5 0.5