I use dorico 3.5 pro. Can i use it simultaneously in deskTop and LapTop?
Assuming you have one licence only, no. If you want to use Dorico on two computers (even non-concurrently), you need to put your licence on a USB dongle for the time being. Lots of people on this forum have complained about it.
The good news is that Steinberg has announced a different licencing policy that would make life much easier, but no date for its introduction has been given yet.