SP Mouse Functions

 RAT_ELBHD()    Determines if left mouse button is held down
 RAT_EQMCOL()   Returns mouse column at last press
 RAT_EQMROW()   Returns mouse row at last press
 RAT_ERBHD()    Determines if right mouse button is held down
 RAT_EVENT()    Event handler - inkey() with mouse awareness
 RAT_ISMOUSE()  Determines mouse usage by RAT_EVENT()
 RAT_LASTEV()   Returns the last event recorded by RAT_EVENT()
 RAT_MENU2()    Mouseable MENU TO emulation
 RAT_READ()     Mouseable read
 RAT_AREA()     Limits the mouse to a rectangular area of the screen
 RAT_COL()      Current mouse column
 RAT_COLL()     Returns mouse column at the last left button press
 RAT_COLR()     Returns mouse column at the last right button press
 RAT_EXIST()    Determines if a mouse is available
 RAT_FORCE()    This forces a mouse present status, regardless
 RAT_LBHD()     Determines if the mouse left button is currently depressed
 RAT_LEFTB()    Determines if the left mouse button has been pressed
 RAT_NOMOUSE()  This forces a no mouse status, regardless
 RAT_OFF()      Sets the mouse cursor off
 RAT_ON()       Sets the mouse cursor on
 RAT_POSIT()    Positions the mouse cursor at row,column
 RAT_RBHD()     Determines if the mouse right button is currently depressed
 RAT_RESET()    Resets the mouse to its default values
 RAT_RIGHTB()   Determines if the right mouse button has been pressed
 RAT_ROW()      Current mouse row
 RAT_ROWL()     Returns mouse row at the last left button press
 RAT_ROWR()     Returns mouse row at the last right button press

SP Misc/Other Functions

 ISPART()       Determines if a value is part of a set
 CURD()         Return current drive letter
 SBROWS()       Determine number of rows in a box
 ISPRN()        Detects printer ready (or not) on LPT1, 2 or 3
 SBCENTER()     Centers box coordinates
 SBCOLS()       Determine number of columns in a box
 EVALQ()        Evaluates a logical condition in a string
 ENDSWITH()     Determines if a string ends with another string
 PRNTFRML()     Prints a formletter created by formletr()
 CDIR()         Change Directory
 VARLEN()       Returns length of a variable  of any type