Standard I-O Functions and Statements

 Printing text on the screen
 ---------------------------
 PRINT
 Outputs text to the screen. Using PRINT with no arguments creates a blank
 line.

 PRINT USING
 Outputs formatted text to the screen.

 Changing the width of the output line
 -------------------------------------
 WIDTH
 Changes the width of the screen to either 40 columns or 80 columns. Also, on
 computers with an EGA or VGA, controls the number of lines on the screen (25
 or 43).


 WIDTH "SCRN."
 Assigns a maximum length to lines output to the screen when used before an
 OPEN "SCRN." statement.

 Getting input from the keyboard
 -------------------------------
 INKEY$
 Reads a character from the keyboard (or a null string if no character is
 waiting).

 INPUT$
 Reads a specified number of characters from the keyboard and stores them in
 a single string variable.

 INPUT
 Reads input from the keyboard and stores it in a list of variables.

 LINE INPUT
 Reads a line of input from the keyboard and stores it in a single string
 variable.

 Positioning the cursor on the screen
 ------------------------------------
 LOCATE
 Moves the cursor to a specified row and column. Also sets cursor size and
 turns it on and off.

 SPC
 Skips a specified number of spaces in printed output.

 TAB
 Displays printed output in a given column.

 Getting information on cursor location
 --------------------------------------
 CSRLIN
 Tells which row or line position the cursor is in.

 POS(n)
 Tells which column the cursor is in.

 Creating a text viewport
 ------------------------
 VIEW PRINT
 Sets the top and bottom rows for displaying text output.