1 03/14/85  revert_output, ro
 2 
 3 Syntax as a command:  ro {-control_args}
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 5 
 6 Function: reverts the effect of the file_output, syn_output, and
 7 terminal_output commands, i.e., releases the most recent preceding
 8 command.
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10 
11 Control arguments:
12 -all, -a
13    reverts all file_output, syn_output, and terminal_output attachments
14    for specified I/O switches or for all switches if you specify none.
15 -source_switch STR, -ssw STR
16    specifies the name of an I/O switch to be redirected.  (Default:
17    user_output)
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19 
20 Notes: Each command invocation of file_output, terminal_output, or
21 syn_output stacks up another attachment for each of the specified
22 switches.  The revert_output command pops and restores one attachment
23 from the stack; it does not revert attachments made, for example, by
24 the io_call command.