I agree with pmegan that the Smart Key is probably your best option.
Go to POS Configurator -> Devices -> Smart Keys.
Click the upper blue plus button (its in about the upper-middle of the window); this will create a new Smart Key Group.
On the far left you will now have a blank entry with a number, but no name. Go ahead and name it something that makes sense (like Smart Send).
Now change the rule type from Revenue Center, the default, to Employee Class. Click the green check button. You should now have another blue plus button in the lower window. Click this button to create a new condition for the smart key.
In the smart keys table, you should now have a new row with number 1, but again, no name. Name this Bartender for easy reference.
In the employee class drop down select your bartender class (note that if you use Bar Cards, you likely have another class with a name similar to Bar Cards.. use this employee class instead of Bartender if you have it).
In the legend field, type whatever you want it to say; in this case, you will probably want it to just say Send.
Now in the category drop down, select Tender/Media Number. The drop down directly below the category drop down should now say Tender Media. Click this and find your Print tender media. Most likely whoever did the original programming made it so that if you print, it also service totals and fires the order. If printing does NOT do this, you will need to edit the tender media so that it does.
Now to the right, you have some drop downs to control the appearance of the button. Normally I use Arial Medium for font, don't select a next, and then for send we usually use White on Kelly. Choose whatever you want.
Repeat this process, but name the next smart key Server, and select your server employee class. And then, instead of selecting the Print tender media, select the Send tender media.
Once you have the key setup, you will need to go into the Touchscreen Designer (POS Configurator -> Devices -> Touchscreen Designer). Find any screens that your bartenders might be able to get to, and replace the send button with the smart key. Do this by changing the button's Category from whatever it is to Function: Smart Key. This will change the drop down directly below to say Smart Key; select your Smart Send button. Click save. Repeat for any send button your bartenders might be able to get to.
Screenshot to give you an idea visually of what I meant: