HP Compaq t5510 Thin Client - Manual (Page 227)

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Initialization Commands
Flashing Characters Enabled In All Sessions
Registry Entry: None
Command Line: -FB
Default Setting: off
This enables characters with the flashing attribute to be displayed as such in all session
windows in addition to the currently focused window.
Reflection 4 Colour Support
Registry Entry: iR4colours = "on"
Command Line: -R4
Default Setting: off
These commands will cause the colours displayed by the emulator to be compatible
with Reflection 4 software.