This looks like a use case for threads. 
use threads;
my @data;

    if ($UseDataOne eq 1){
        push @data, async { [ GetDataOne(@TableParameters) ] };
    }
    if ($UseDatatwo eq 1){
        push @data, async { [ GetDatatwo(@TableParameters) ] };
    }
    if ($UseDataThree eq 1){
        push @data, async { [ GetDataThree(@TableParameters) ] };
    }
    if ($UseDataFour eq 1){
        push @data, async { [ GetDataFour(@TableParameters) ] };
    }
@data = map { $_->join } @data;

[download]
Now @data is an array of arrays containing your portions of data.

In reply to Re: Parallel download Tk by Anonymous Monk
in thread Parallel download Tk by Takamoto

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