What is a scenario?
A scenario is a list of simple commands, stored in a scenario device like F420 (max. 16 scenarios) or IR 3456 (max. 20 scenarios). More and smarter scenarios can be stored in a scenario device like MH200 or the newer model MH200N. These smart scenario devices support event- and time-driven scenarios, even with IF-THEN-ELSE clauses. 
Examples
Scenarios are launched in a similar way like lighting commands:
*0*5*89##        launch scenario #5, connected to address 89
*0*9*48#4#02##   launch scenario #9, connected to address 48 on interface 2
Since a scenario is just a list of commands, they don't have a status and therefore you can't do a status request on a scenario.
Programming a Scenario
To program a scenario, it has to be locked first and after programming it has to be unlocked. Instead of fiddling with OWN message to manage F420 scenarios, you should use a tool like ScenarX
WHAT Table
| WHAT (F420)
 | 
Description
 | 
| 1..16
 | 
Scenario 1 to 16
 | 
| 40#x
 | 
Start recording scenario x
 | 
| 41#x
 | 
Stop recording scenario x
 | 
| 42
 | 
Delete all scenarios
 | 
| 42#x
 | 
Delete scenario x
 | 
| 43
 | 
Lock scenario module
 | 
| 44
 | 
Unlock scenario module
 | 
| 45
 | 
Scenario module not available
 | 
| 46
 | 
Memory full
 | 
| WHAT (IR 3456)
 | 
Description
 | 
| 1..20
 | 
Scenario 1 to 20
 | 
| WHERE
 | 
Address
 | 
| 01..99
 | 
Control Panel 01 to 99
 |