PURPOSE: Send a ping request to a specific node. (Experimental, but safe)
SYNTAX: [destinationNode:Integer,[CoC_ClientChannel:Integer,daytime:Number], "fNPing"] call fNSend
RETURNS: nothing
EXAMPLES:
[[CoC_ClientChannel,daytime], "fNPing"] call fNSendAll
[1,[CoC_ClientChannel,daytime], "fNPing"] call fNSend
HISTORY: CoC bn880 14/11/2003
DEPENDENCIES: CoC_LIBNUMSYS, CoC_LIBNETWORK