3e SRD:Scry Skill
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Scry (Int; Cleric, Druid, Sorcerer, Wizard Only)
The character can't use this skill without some magical means to scry. Use of this skill is described in association with those spells and items. These items allow the character to spy on others, and this skill just lets the character do it better. This skill also improves the character's chance to notice when the character is being scried, as detailed in the descriptions of the arcane eye and detect scrying spells.
Although this skill is exclusive to certain classes, it can be used untrained. This means that a character with no ranks in Scry, and who is not allowed to buy ranks in this skill, can still make an Intelligence check to notice when he is being scried.