The way tD_Datura_v says is the best way, IMHO, but others may disagree.

So i would use define the structs this way
Code:
typedef struct Cue {
	STRING* entname;
	VECTOR  startpos;
	VECTOR  endpos;
	ANGLE   startang;
	ANGLE   endang;
	VECTOR  startscale;
	VECTOR  endscale;
	STRING* anim;		//animation name- or NULL
	var     animloops;
	var     starttime;
	var     duration;
	struct  Cue* next;	//used when the cue is in the linked list of active cues
	struct  Cue* prev;
} Cue; 

typedef struct Keyframe {
	var  cuetime;
	var  actions_count;
	Cue* actions[64];
} Keyframe;


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