It's funny to remember Dune 2 and Warcraft 1 didn't let you select multiple units. You had to click and move one unit at a time so group attacks were really tedious and cumbersome. I was always curious why the interface designers didn't think to add multiple select at the time.
I remember getting units in one screen, moving the mouse pointer onto a target location in the map, and then doing a series of Tab-M-Clicks: Tab selects the next unit, M selects the Move command, and Click on the target.
