Is it securely: `hostname`:10 ?

[Хорев Сергей Николаевич]

Hello,
I am using OpenSSH 1.2.1 on Solaris 2.6.
I am using X forwarding intensively. During work OpenSSH creates
display like `hostname`:10. Is it securely?? Why not 127.0.0.1:10 or 
localhost:10 ?

	Best regards
	Sergey Khorev.