HP SCANJET SCANNER DRIVER
 HPS_CLOSE()  Closes the scanner buffer.
 HPS_INQ()    Inquires from the scanner.
 HPS_OPEN()   Opens a scanner buffer.
 HPS_PRINT()  Sets up the scanner for a printer.
 HPS_RESET()  Resets the scanner.
 HPS_SCAN()   Scans an image to a PCX file.
 HPS_SETUP()  Sets a scanner parameter.
 HPS_STATE()  Returns the scanner state to an array.