It depends. For online use, some sites require payment of membership fee before use, some charges fee per transaction and some charges free. This is exclusive of cost incurred by the user/s from their network provider.
According to Norton's site, pcanywhere costs $200 retail. Online, however, pcanywhere retails for $16 to $140. A free trial of the software may be found on Softpedia's site.
Common costs are shared between the units ie departments or products. Traceable costs are specific to the unit. While I've never heard common costs being called untraceable they are cannot be...