Screen Functions:
  Overview        About these routines
  XPpackScr()     Pack a saved screen variable.
  XPunpackScr()   Unpack a packed saved screen variable.
  XPattr2clr()    Convert an Attribute to a Clipper color string             .
  XPclr2attr()    Convert a Clipper color string to an Attribute             .
  XPshadow()      Just another Shadow function
  XPsetShadow()   Turn shadowing globally on/off                             .
  XPcolorScr()    Color a part of the screen                                 .
  XPgetText()     Get text from a screen position.
  XPgetScreen()   Return area of a screen text as a Memo var.
  XPreplAttr()    Low Level routine to replace attributes
  XPdelAttr()     Low Level routine to Delete attributes
  XPinsAttr()     Insert Attributes in a string                              .