Format of Connection Manager protocol command vector:
Offset	Size	Description	)
 00h	WORD	(big-endian) total length of command (including this word)
 02h	WORD	(big-endian) command code
		EF01h Connection Request
		EF06h Modify Connection Parameters
 04h  N BYTEs	list of subvectors (see #00313)
		allowable subvector types are 01h-04h,17h,18h for command code
		  EF01h; 03h,04h for command code EF06h (see #00312)