You can bring up the Verilog-XL GUI (SimVision) by the following 2 ways,
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1) Use +gui option
> verilog <design>.v +gui
OR
2) Call SimVision
> simvision &
LDV ==> Logic Design & Verification. It is now renamed to be IUS - Incisive Unified Simulator. It includes Specman too, read more about advanced Specman from: