String class + Documentation Questions

[John Retta]

I have successfully built egcs 1.0.3 on an HP-UX 10.20
platform.

When I try to compile legacy C++ code which uses the
standard String Class, I receive compile errors basically
stating it can not find String.h.

How is the String Class accessed?  [ie. what is the correct
.h file?]

Where is documentation describing gcc/egcs C++ standard
library classes? [either on the web or installed as part
of the egcs install]

Thanks, John Retta