Borland C++ Builder 6: Webcam(Input device)

Hi all,
I am trying to write a software for my laser interferometery setup.(Totally new in C++) In simple, i am trying to create a window to show what is captured in my webcam which is plugged into my USB port.
I have no problem with pics(bit map and jpeg) , neither do i have problem with showing available clips in the dialog box i have created. However how can i display what is captured by the web cam in my dialog box?How can i deal with input device?(Its not as if it's a downloaded clip or what). It is neccessary for my program to constantly take info from the input device. In addition, how can i program it to take still shots?(i.e. lock the image at second intervals)

Thank you in advance.

ks