SYNTAX        VHA_CHKPRN(P1,P2,P3,P4)

PURPOSE       Checks printer status

ARGUMENTS     P1 - NUMERIC
                 - OPTIONAL
                 - DEFAULT: public variable MSG_REG
                 - upper line of window

              P2 - NUMERIC
                 - OPTIONAL
                 - DEFAULT: public variable MSG_COL
                 - left column of window

              P3 - NUMERIC
                 - OPTIONAL
                 - DEFAULT: public variable BOX_BORDER
                 - kind of border of window
                   see VHA_BOX() for values

              P4 - CHARACTER
                 - OPTIONAL
                 - DEFAULT: standard color value CL_OKAY
                 - color

RETURNS       LOGICAL
               .T. if confirmed
               .F. if not confirmed