SSRS Role ID and TaskMask

Hello,

I need to find out who has access to what on SSRS.  From the User table, I can query something like the following.   

Questions:
1) What is Role ID?  Is this a 1:1 map to a user?
2) What is TaskMask?  Is this a 1:1 map to a specific item (ie folder/report)?
3) How do I find out the mapping (ie the actual user name or folder/report name)?

RoleID	RoleName	Description	TaskMask	RoleFlags
30429381-0F4C-45E9-9136-AB4FE71CCD71	View Folder	View folder structure and reports available (incl report definition) but can't run reports	0000001000000000	0
DF7F6687-DF4E-4D2A-B1A8-B0917EA4E82C	Browser	May view folders, reports and subscribe to reports.	0010101001000100	0
DF7F6687-DF4E-4D2A-B1A8-B0917EA4E82C	Browser	May view folders, reports and subscribe to reports.	0010101001000100	0
30429381-0F4C-45E9-9136-AB4FE71CCD71	View Folder	View folder structure and reports available (incl report definition) but can't run reports	0000001000000000	0
DF7F6687-DF4E-4D2A-B1A8-B0917EA4E82C	Browser	May view folders, reports and subscribe to reports.	0010101001000100	0
DF7F6687-DF4E-4D2A-B1A8-B0917EA4E82C	Browser	May view folders, reports and subscribe to reports.