Simplify TSQL query

Hi Friends, I was trying to finetue a query and come across a piece of code written by some expert developer and I could not understand what the second clause in this query meant for.One in which he is using " 1>=" for count of join based on column of outer query
I cannot find the meaning of this query. Any view is appreciated.

SELECT COL1 ,

COL2 ,

COL3

FROM TAB1

 WHERE COL2=1 

AND 1>=

 (

    SELECT COUNT(*) 

    FROM TAB2

    WHERE    


           TAB2.P_COL='{D7079DEF-0FF2-42C3-85CD-2D357E096E9E}'

           AND 

          TAB2.COL2=TAB1.COl1

)