"Hold a password. There are three ways to get the password.

If there is no password (sequence == nil), ask the user for it.

If the use supplied one during this session, return that. It is cleared at shutDown.

If sequence is a number, get the server passwords off the disk. File 'sqk.info' must be in the same folder 'Squeak.sources' file. Decode the file. Return the password indexed by sequence."

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	decode: serverPasswords

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	cache:
	passwordFor: Returned the password from one of many sources. OK if send in a nil arg.
	sequence
	sequence:

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	decode: Xor with secret number -- just so file won't have raw password in it
	serverPasswords Get the server passwords off the disk and decode them. The file 'sqk.info' must be in the same folder as the Squeak application (VM) that is running this image. (Note: This code works even if you are running with no system sources file.)

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	shutDown Forget all cached passwords, so they won't stay in the image