``

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Real-time mouse input and set text font (Original Enhancement)

`MOUSE POLL x, y, left, right
` assigns the current mouse position to numeric variables x, y,
and the current mouse state to numeric variables left, right,
1 for button pressed, 0 for not pressed.
Note. On MAC, one spare click on outside reqired.

`SET TEXT FONT FontName$ ，size`
Assign the text font and the size in points used in PLOT TEXT statements.
Example.
`SET TEXT FONT "Courier New",11`
An empty string assigned, only the size shall be changed.