To deploy a com component and use it in .net::::::::::::

can use type library importer to convert a com dll to .net dll
or
blindly give a reference of com component in the com tab section in add references and start using it as if a normal .net dll.
RCW -- Runtime callable wrapper class acts here and performs as if its a .net dll

Wannna share a dll across applications?? :::::::::::
goto .net cmd
sn.exe -k
include the file name in assembly info assemblykeyfile("whole filename path") build the project.
copy the dll and put it in gac