to make use of remote assistance on my computer ,do I have to enable some services too?

hi,

besides enabling   allow remote assistance  a to  this computer    under external link in the properties of computer ,

which is to ask asistance from distance to solve smal problems on the computer

which services do I have to enable else ?

 do I have to allow   some  programs in  firewall   too   to  benefit of this utility of Microsoft like netvieuwer

thanks

johan

h.david