Hi
we had similar issue
user want to close sap logon pad but they are not able to close until they close all open SAP session.
but SAP provided a solution with SAP gui 7.30 patch 5 onwards called "Hide SAP Logon (Pad) to Tray bar"
if you enable this option you can close the sap logon pad without ending SAP open sessions.
if your option "Hide SAP Logon (Pad) to Tray bar" is disabled you can enable it via SAP GUI configuration->SAP logon Pad Options->General here you can see this option.
if you can not modify via above said path...
you can enable by editing registry values... to do this follow as mentioned below..
regedit->HKEY_LOCAL_MACHINE->software->SAP->SAPLogon->Options-- here you can add new REG_DWORD value
Note: you may not find Options key after SAPlogon key, if you don't then just create new key called Options and add the below values..
Value name should be HideToTrayBar
Value Data should be 1
I hope this helps
you can also check note 1749369 for more details
Regards
Ravi