display DHT11 readings on the LCD and get readings to computer at the same time
How is the computer connected to the Arduino?
What software captures the data from Arduino?
If it is the serial monitor of the IDE a statement like Serial.println(reading); in the right place should be enough
BTW there are many DHT 11 sketches on this forum, you can search for them in the upper right corner but be patient as it is not that fast.