The Delete a Viewport routine deletes the specified viewport from
    any pasteboards to which it is pasted.

    Format

      SMG$DELETE_VIEWPORT  display-id

1 - Returns

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

2 - Argument

 display-id

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

    Identifier of the virtual display associated with the viewport to
    be deleted. The display-id argument is the address of an unsigned
    longword containing the display identifier.