T-Bar Auto Gears & How to use them

Hi, On my Volvo 740 Turbo T-Bar Auto I have gears 1, 2 and Drive and a button on the right side of the T-Bar.
When I drive my Volvo I engage D - Drive, but I don't have any idea what gears 1 and 2 are for or how to use them. Also the button on the side of the T-Bar, I think electronically increases the torque for when I pull a trailer - is that right?
Does anyone know what sort of pulling power the Volvo 740 Turbo can pull. It has been suggested to me that 1/2 ton is probably the limit, but I really have no idea.
Any input would be highly appreciated re my questions above.
BigBenn:)
 
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