I have a Dll which is built in VC++. I have no source code of it.
I want to add some more functioanlities in it for that i have to know its previous functions .
can any body tell me how to set break points using int3 or 0cch instruction from the scratch

hit ctrl+e then type CC on desired location ,then in debugging option make sure int3 exception not pass to victim.

Thanx
Teerayoot ,

I have got another option by using hex editor but it is too much easy then that.

Again Thanx . I will also put some more queries when i will go to advance