VMS Help RTL Routines, SMG$, SMG$ERASE_COLUMN  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Erase Column from Display routine erases the specified
    portion of the virtual display from the given position to the
    end of the column.

    Format

      SMG$ERASE_COLUMN  display-id [,start-row] [,column-number]

                        [,end-row]

1 - Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2 - Arguments

 display-id

    OpenVMS usage:identifier
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference

    Identifier of the virtual display to be affected. The display-id
    argument is the address of an unsigned longword containing this
    virtual display identifier.

 start-row

    OpenVMS usage:longword_signed
    type:         longword (signed)
    access:       read only
    mechanism:    by reference

    Optional line number at which the erase operation begins. The
    start-row argument is the address of a signed longword that
    contains the specified line number. If this argument is omitted,
    the column-number argument is ignored and the erase operation
    begins at the current location of the virtual cursor for that
    virtual display.

 column-number

    OpenVMS usage:longword_signed
    type:         longword (signed)
    access:       read only
    mechanism:    by reference

    Optional column number at which the erase operation begins.
    The column-number argument is the address of a signed longword
    that contains the specified column number. If this argument
    is omitted, the start-row argument is ignored and the erase
    operation begins at the current location of the virtual cursor
    for that virtual display.

 end-row

    OpenVMS usage:longword_signed
    type:         longword (signed)
    access:       read only
    mechanism:    by reference

    Optional row number at which the erase operation ends. The end-
    row argument is the address of a signed longword that contains
    the specified row number.