Different Key Macros per session

We are under Wavelink Telnet on Windows CE

We have two sessions, one is VT220 and the other is 5250

since pressing F5 transmit nothing by default under a VT session, whe've added a Key Macro to generate Esc[15~ (mandatory in my customer's application)

the problem is when we switch to the 5250 session and press F5 : the same key macro is generated instead of the expected 5250 F5

Is there a possibility to specify in a key macro which session is concerned to avoid this problem ?

Thanks