How can you extract shellcode from a C program using VC6.0 DEBUG mode?

First, write a simple C program that calls an API like `MessageBoxA` and set a breakpoint. In debug mode, use Alt+8 to view the disassembly and note the call instruction's address. Then rewrite the program using inline assembly with the known API address (e.g., `0x77D507EA` for MessageBoxA on Windows XP). Debug again, open the Memory window (Alt+6) at the start of your inline assembly block, and copy the hex bytes from the beginning to the end of the call instruction. Those bytes form your shellcode. Note that this method is ASLR-dependent and only works on older systems without ASLR.