PreShared key limitations for Site-to-Site VPN

What are the limitations (length / allowed characters / etc) for a PreShared key for an IPSec tunnel from a PIX to;
a) Another PIX
b) A Cisco VPN Concentrator
c) A Cisco VPN Client

I'm guessing its all the same, but can;t really find a definitive answer anywhere.

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For static VPNs :-
According to it can be up to 128 bytes (characters) in length.

For the cisco vpn client it works a bit differently. User authentication is used rather than relying on a shared key.

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