Temp Block Printing on a Network

We have 20 Windows xp comps connected to one printer on our network

The comps are connected to each other and our printer through a switch (lan) using peer to peer sharing (without a server)

some pcs need to print on letter heads or pre printed forms (which are very expensive)

Is there some software or commad i can use where i can block or hold all print commads to that printer (using its ip) except from the pc that executes that commad

so that the pre printed forms and letter heads are not wasted

We dnt have a seprate printer for the pre printed forms

By the time the form is loaded into the printer and the commad is given
some other guy gives his print