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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.