LWP::Protocol        (3)  - Base class for LWP protocols
LWP::Protocol        (3pm)  - Base class for LWP protocols
XGetWMProtocols [XSetWMProtocols] (3x)  - set or read a window's WM_PROTOCOLS property
XSetWMProtocols      (3x)  - set or read a window's WM_PROTOCOLS property
protocols            (5)  - the protocols definition file