[#BloombergLP-balb-ControlManager-registerUsageHandler]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balb.adoc[balb]::xref:BloombergLP/balb/ControlManager.adoc[ControlManager]::registerUsageHandler
:relfileprefix: ../../../
:mrdocs:

Register a handler that, on receipt of a (case‐insensitive) "HELP" message, prints to the specified stream a list of this `ControlManager`s registered commands and their documentation. Return a positive value if an existing callback was replaced, return 0 if no replacement occurred, and return a negative value otherwise.

== Synopsis

Declared in `<balb_controlmanager.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
registerUsageHandler(std::ostream& stream);
----


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