VS 2003 prerequisite CD missing - error Not able to Install

lately i faced this issue where i do not had VS 2003 prerequisite CD and after downloading
en_vs.net_2003_enarch_full.exe from MSDN (i have a legal license to download ) i was constantly getting this
error wher it said pre requisite not met
i google and try to look for pre requisite and answer was there are basically 3 prerequisite

to obtain .NET 1.1:

http://www.microsoft.com/downloads/details.aspx?FamilyID=262d25e3-f589-4842-8157-034d1e7cf3a3&displaylang=en

.NET Framework 1.1 SP1:

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=A8F5654F-088E-40B2-BBDB-A83353618B38

J# 1.1 redistributional package:

http://www.microsoft.com/downloads/details.aspx?FamilyId=E3CF70A9-84CA-4FEA-9E7D-7D674D2C7CA1&displaylang=en

 
Alas i had all 3 of them on my System (Control panel will tell u ) but still i couldnt get through
then i come through a tech note from MS which suggested that
for such problems
the solution is to
Locate till the SetUp.exe
and Use this Switch to Run setup.exe

"setup.exe /NO_BSLN_CHECK"




And Magic !!!!
my VS 2003 started installing 


i did put some effort in understanding what BSLN switch actually does but couldnt get a very good ad shareable answer 
if you know please do share 




So the first thing came in my mind was to share this trick