Questions about basic pointer usage

- what is a pointer?

- how are & and * operators called?
  what do they do?

- what does this line of code declare?
	int *p, v;
 
- what about this one?
	int* p, v;

- what does this code do:
	int v=1, *p;
	p=&v;
	cout << *p;

- what would this code do?
	int v=1, *p, **pp;
	p=&v;
	pp=&p;
	cout << *p << " " << **pp;

- what do these declare?
	int *const p;
	const int *p;
	int cont *p;

- what is the relationship between a
  pointer and an array name?

- what's lose pointer?

- what do these lines declare?
	const int *p;
	int *const p;

- what is NULL?