Mouse.txt notes for mouse processing:

Mouse function 'Hide' should be used before any menu write, then mouse
function 'Show' after the display is updated, this allows the mouse cursor
in DOS to be hilighted over any menu selection or display. Mouse 'Hide' is
re-entrant, that is, multiple calls to mouse 'Hide' are counted, then the
same number of mouse 'Show' functions must be called. Should usually locate
cursor after mouseshow.

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