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If two printers connected to the same PC you should make one as default printer..
Eg. Pc 1 -->P1505n & HP 6600
pc 2--> no printer
Pc 1 need HP 6600
pc 2 need 1 P1505n
you have to set HP 6600 as default to pc 1 and
P1505n default for pc 2
also you have suitable drivers for both printers..
check whether you shared properly...
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