James questions

• What does $$@ mean in a makefile?
• Is there an equivalent of the C function mbsinvalid on Linux?
• Does MSBuild need Visual Studio to be installed?
• Does the MTU of a TCP packet include the TCP & IPv4 headers?
• Is there a way to count tokens in C?
• Is there a difference between <winsock.h> and <winsock2.h>?
• How secure are PHP sessions?

James answers