how to know which is the class that sends the signal in qt ?

[sliverTwist]

My question is about how to know which is the class that sends the signal because what i want to do is specified to the class that has sent the signal
is it possible to do that ?
this is a prototype of what i intend to do

if (signal comes from class 1)
    {do specified actions }
    else if (comes from class 2)
    {do something else }

if (signal comes from class 1)
    {do specified actions }
    else if (comes from class 2)
    {do something else }

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Thanks