Seems as if the 730SE lacks the external AGP bus, and in consequence also lacks the alternative feature of using a SiS 301 display companion card in the AGP slot for dual-head operation from the 730's internal VGA.
Following the suffixes they used on the 630 series (630: display companion only, 630S AGP/dc, 630E neither), it should be named 730E - why they call it 730SE escapes me ...
Regards, Peter