while: wend

[fistfullofnails]

On Terry Ritchie's function/subroutine part of the QB64 tutorial, line 15 of subs.base,  we have:

Code: (Select All)

WHILE _MOUSEINPUT: WEND

The only way I've seen "WHILE" and "WEND" used is at the start and end of a loop, with some instructions  in between, which then ends with 'WEND".
I'm confused on what is exactly going on here.  Can anyone explain like I'm a five year old?

Code: (Select All)

DO
    _LIMIT 60
    WHILE _MOUSEINPUT: WEND
    IF _MOUSEBUTTON(1) THEN DrawStar _MOUSEX, _MOUSEY
    IF _MOUSEBUTTON(2) THEN Directions
    _DISPLAY
LOOP UNTIL _KEYDOWN(27)