Stopping the Boot

[Red_Eye]

Hi all.
Has been a while, can't remember how to do it.
There is something in my startup-sequence that freezes the machine up when booting.  I would like to get rid of this line that is freezing it up, but I can't get into WB to edit the startup-sequence.  Is there a way of just bringing up a shell or something?  Thanks.

[Red_Eye]

That's RIGHT... How could I forget?

Thank-you.
Thank-you VERY much.

And for the promptness thank-you.