As a server does not have any standard input device such as a keyboard,
it is difficult to debug user programs running on the server.
`ox_asir' pops up a small command window to input debug commands
when an error has occurred during user a program execution or
ox_rpc(id,"debug") has been executed.
The responses to commands are shown in `xterm' to display
standard outputs from the server. To close the small window,
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