This function within Windows allows users who have difficulty in holding down the left mouse button to click once, move the mouse and then click again.
On the Start menu > Control Panel > Mouse (if you are not in Classic View, you may have to go to Printers and Other Hardware first.)
Classic view of the Control Panel
When the Mouse Properties dialogue box opens, go to the Buttons tab and then Clicklock.
Put a tick in the Turn on Clicklock box.
If you then click on Settings, you can set the amount of time you have to hold the mouse button down for.