To stop an application from your window manager, you need to publish (using a write() call) a stop command to the PPS launcher control object.
After having opened the /pps/services/launcher/control object for publishing, call write() to modify the object's attributes. Use the appropriate message format with the valid stop command.
#define CMD_START "stop" ... int msgsize; char msgbuf[4096]; int ret = 0; char *id = strdup("101"); char *data = strdup("HelloWebWorks.testDev_lloWebWorks1fa80f60"); ... msgsize = snprintf(msgbuf, sizeof(msgbuf), "msg::%s\ndat::%s\nid::%s", CMD_STOP, data, id); ret = write(pps_fd, msgbuf, (unsigned)msgsize);