1. In a computer system comprising a host system, a target system and an in-circuit emulation bus, said in-circuit emulation bus for communication of in-circuit emulation commands and data between said host and said target, a method for said host to invoke a complex in-circuit emulation teat of said target, said method comprising the steps of: said host accessing said target across said in-circuit emulation bus and setting a test desired indicator to indicate to said target that said complex in-circuit emulation test is to be performed, said complex in-circuit emulation test having an impending test point wherein an impending test criterion can be determined to be met and a begin test point wherein a begin test criterion can be determined to be met; after setting said test desired indicator, said host notifying said target to resume execution; said target then resuming execution; if said test desired indicator has been set and said target reaches said impending test point, said target setting a test break indicator and resuming execution without intervention from said host; and if said test break indicator has been set and said target reaches said begin test point, said target halting said execution and permitting said host to perform said complex in-circuit emulation test.