`tcustombufstream`
		buflen
		usewritebuffer
	ro	eof
	ro	bufpo

`tmsefilestream`
	ro	filename
	ro	openmode
	ro	transactionname
	ro	ismemorystream
		capacity
		filerights
		cryptohandler

`THandleStream`
	ro	Handle

`TStream`
		Position
		Size
	ro	memory