single-user debug mode

[Brad Larson <bel_(_at_)_qedinc_(_dot_)_com>]

Hello,

When openbsd fails in single-user mode, it seems to come up in a
debugger. Is there somewhere I can find what the commands are? 

We know so far:
T=trace exception
r=registers
Q=quit 
some other commands for listing and breakpoints

Thanks,
Brad