Full documentation for Proof General is included in the When running Proof General the manual is available from the "Proof General" menu. It should also appear in the system info pages.
For convenience, the manual is available in HTML
For printing you can download the
.
Warning: the manual above is taken from the current pre-release and may be updated from the documentation included in the last stable release.
Proof General supports Script Management as documented in:
It has support for Proof by Pointing, as documented in: