The Spawn Subprocess routine requests the command language
    interpreter (CLI) of the calling process to spawn a subprocess
    for executing CLI commands. LIB$SPAWN provides the same function
    as the DCL command SPAWN.

    Format

      LIB$SPAWN  [command-string] [,input-file]

                 [,output-file] [,flags] [,process-name]

                 [,process-id] [,completion-status-address]

                 [,byte-integer-event-flag-num] [,AST-address]

                 [,varying-AST-argument] [,prompt-string] [,cli]

                 [,table]