a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS131 [Section] 9.2 [Statement text] 
When URL activations occur, the Consumer MUST process all mode and window state change requests and either honor and reject them prior to invoking the operation indicated by the URL. If the requested mode or window state is for a value that is either invalid or unavailable, the Consumer SHOULD leave the current value unchanged.
WSRP v2.0 Specification
Statement text