Syntax
'BO'
Description
The 'BO' mnemonic turns output transparency on for terminal devices.
When transparency is on, all data is passed through the device driver
without translation, except for the 'EO' and 'RM' mnemonics, to prevent
interception of characters that ordinarily are special characters to the
driver, such as ESC. PRO/5 sends standard mnemonics as $1B$ (ESCAPE) plus
the two-character mnemonic. Long mnemonics are sent as $1B$, plus a length
byte and the characters representing the mnemonic.
Output transparency invalidates the buffering maintained by PRO/5 and requires
an 'RS' (Refresh Screen)
mnemonic to restore coherency. The 'EO'
mnemonic ends output transparency.