Download Play services are not used by the Download Play child application at all(the title which runs on the Download Play clients). This is used instead: APT:GetWirelessRebootInfo.
There can only be one session open for each individual DLP service at a time.
Download Play Client Service "dlp:CLNT"
| Command Header
 | 
Available since system version
 | 
Description
 | 
| 0x000100C3
 | 
?
 | 
?
 | 
| 0x00020000
 | 
?
 | 
?
 | 
| 0x00030000
 | 
?
 | 
Unknown. Writes 0x18-bytes of output starting at cmdreply[2].
 | 
| 0x00040000
 | 
?
 | 
Unknown. Writes an output u16 to cmdreply[2].
 | 
| 0x00050180
 | 
?
 | 
?
 | 
| 0x00060000
 | 
?
 | 
?
 | 
| 0x0007....
 | 
?
 | 
?
 | 
| 0x0008....
 | 
?
 | 
?
 | 
| 0x0009....
 | 
?
 | 
?
 | 
| 0x000A....
 | 
?
 | 
?
 | 
| 0x000B....
 | 
?
 | 
?
 | 
| 0x000C....
 | 
?
 | 
?
 | 
| 0x000D....
 | 
?
 | 
?
 | 
| 0x000E....
 | 
?
 | 
?
 | 
| 0x000F....
 | 
?
 | 
?
 | 
| 0x0010....
 | 
?
 | 
?
 | 
| 0x00110000
 | 
?
 | 
Writes 9-bytes of output starting at cmdreply[2].
 | 
| 0x0012....
 | 
?
 | 
?
 | 
| 0x0013....
 | 
?
 | 
?
 | 
| 0x0014....
 | 
?
 | 
?
 | 
Download Play Server Service "dlp:SRVR"
| Command Header
 | 
Available since system version
 | 
Description
 | 
| 0x00010183
 | 
 | 
Initialize...
 | 
| 0x00020000
 | 
 | 
Finalize...
 | 
| 0x00030000
 | 
 | 
unknown...
 | 
| 0x00040000
 | 
 | 
unknown...
 | 
| 0x00050080
 | 
 | 
unknown...
 | 
| 0x00060000
 | 
 | 
unknown...
 | 
| 0x00070000
 | 
 | 
unknown...
 | 
| 0x000800C0
 | 
 | 
unknown...
 | 
| 0x00090040
 | 
 | 
unknown...
 | 
| 0x000A0040
 | 
 | 
unknown...
 | 
| 0x000B0042
 | 
 | 
unknown...
 | 
| 0x000C0040
 | 
 | 
unknown...
 | 
| 0x000D0040
 | 
 | 
unknown...
 | 
| 0x000E0040
 | 
 | 
unknown...
 | 
| 0x000F0303
 | 
 | 
unknown...
 | 
| 0x00100000
 | 
 | 
unknown...
 | 
"dlp:FKCL"
| Command Header
 | 
Available since system version
 | 
Description
 | 
| 0x0001....
 | 
?
 | 
?
 | 
| 0x0002....
 | 
?
 | 
?
 | 
| 0x0003....
 | 
?
 | 
?
 | 
| 0x0004....
 | 
?
 | 
?
 | 
| 0x0005....
 | 
?
 | 
?
 | 
| 0x0006....
 | 
?
 | 
?
 | 
| 0x0007....
 | 
?
 | 
?
 | 
| 0x0008....
 | 
?
 | 
?
 | 
| 0x0009....
 | 
?
 | 
?
 | 
| 0x000A....
 | 
?
 | 
?
 | 
| 0x000B....
 | 
?
 | 
?
 | 
| 0x000C....
 | 
?
 | 
?
 | 
| 0x000D....
 | 
?
 | 
?
 | 
| 0x000E....
 | 
?
 | 
?
 | 
| 0x000F....
 | 
?
 | 
?
 | 
| 0x0010....
 | 
?
 | 
?
 | 
| 0x0011....
 | 
?
 | 
?
 |