The Delete Logical Name routine requests the calling process'
    command language interpreter (CLI) to delete a supervisor-mode
    process logical name. LIB$DELETE_LOGICAL provides the same
    function as the DCL command DEASSIGN.

    Format

      LIB$DELETE_LOGICAL  logical-name [,table-name]

1  –  Returns

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

2  –  Arguments

 logical-name

    OpenVMS usage:logical_name
    type:         character string
    access:       read only
    mechanism:    by descriptor

    Logical name to be deleted. The logical-name argument is the
    address of a descriptor pointing to this logical name string. The
    maximum length of a logical name is 255 characters.

 table-name

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by descriptor

    Name of the table from which the logical name is to be deleted.
    The table-name argument is the address of a descriptor pointing
    to this name string. This is an optional argument. If the
    argument is omitted, the LNM$PROCESS table is used.